Data aided channel oriented tone reservation

ABSTRACT

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of parameters for estimating tone reservation (TR) subcarriers, based at least in part on energies of data symbols of a communication, having tone reservation applied for the communication. The UE may receive the communication having the tone reservation applied to the TR subcarriers. Numerous other aspects are described.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wirelesscommunication and to techniques and apparatuses for data aided channeloriented tone reservation.

BACKGROUND

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, or the like). Examples of such multiple-accesstechnologies include code division multiple access (CDMA) systems, timedivision multiple access (TDMA) systems, frequency-division multipleaccess (FDMA) systems, orthogonal frequency-division multiple access(OFDMA) systems, single-carrier frequency-division multiple access(SC-FDMA) systems, time division synchronous code division multipleaccess (TD-SCDMA) systems, and Long Term Evolution (LTE).LTE/LTE-Advanced is a set of enhancements to the Universal MobileTelecommunications System (UMTS) mobile standard promulgated by theThird Generation Partnership Project (3GPP).

A wireless network may include a number of base stations (BSs) that cansupport communication for a number of user equipment (UEs). A UE maycommunicate with a BS via the downlink and uplink. The downlink (orforward link) refers to the communication link from the BS to the UE,and the uplink (or reverse link) refers to the communication link fromthe UE to the BS. As will be described in more detail herein, a BS maybe referred to as a Node B, a gNB, an access point (AP), a radio head, atransmit receive point (TRP), a New Radio (NR) BS, a 5G Node B, or thelike.

The above multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent user equipment to communicate on a municipal, national,regional, and even global level. NR, which may also be referred to as5G, is a set of enhancements to the LTE mobile standard promulgated bythe 3GPP. NR is designed to better support mobile broadband Internetaccess by improving spectral efficiency, lowering costs, improvingservices, making use of new spectrum, and better integrating with otheropen standards using orthogonal frequency division multiplexing (OFDM)with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP-OFDMand/or SC-FDM (e.g., also known as discrete Fourier transform spreadOFDM (DFT-s-OFDM)) on the uplink (UL), as well as supportingbeamforming, multiple-input multiple-output (MIMO) antenna technology,and carrier aggregation. As the demand for mobile broadband accesscontinues to increase, further improvements in LTE, NR, and other radioaccess technologies remain useful.

SUMMARY

In some aspects, a method of wireless communication performed by a basestation includes transmitting an indication of parameters for estimatingtone reservation (TR) subcarriers, based at least in part on energies ofdata symbols of a communication, having tone reservation applied for thecommunication; and transmitting the communication having the tonereservation applied to the TR subcarriers.

In some aspects, a method of wireless communication performed by a basestation includes transmitting an indication of parameters that the basestation uses for estimating TR subcarriers, based at least in part onenergies of data symbols of a communication, having tone reservationapplied for the communication; and receiving the communication havingthe tone reservation applied to the TR subcarriers.

In some aspects, a method of wireless communication performed by a userequipment (UE) includes receiving an indication of parameters forestimating TR subcarriers, based at least in part on energies of datasymbols of a communication, having tone reservation applied for thecommunication; and receiving the communication having the tonereservation applied to the TR subcarriers.

In some aspects, a method of wireless communication performed by a UEincludes receiving an indication of parameters that a base station usesfor estimating TR subcarriers, based at least in part on energies ofdata symbols of a communication, having tone reservation applied for thecommunication; and transmitting the communication having the tonereservation applied to the TR subcarriers.

In some aspects, a base station for wireless communication includes amemory; and one or more processors, coupled to the memory, configuredto: transmit an indication of parameters for estimating TR subcarriers,based at least in part on energies of data symbols of a communication,having tone reservation applied for the communication; and transmit thecommunication having the tone reservation applied to the TR subcarriers.

In some aspects, a base station for wireless communication includes amemory; and one or more processors, coupled to the memory, configuredto: transmit an indication of parameters that the base station uses forestimating TR subcarriers, based at least in part on energies of datasymbols of a communication, having tone reservation applied for thecommunication; and receive the communication having the tone reservationapplied to the TR subcarriers.

In some aspects, a UE for wireless communication includes a memory; andone or more processors, coupled to the memory, configured to: receive anindication of parameters for estimating TR subcarriers, based at leastin part on energies of data symbols of a communication, having tonereservation applied for the communication; and receive the communicationhaving the tone reservation applied to the TR subcarriers.

In some aspects, a UE for wireless communication includes a memory; andone or more processors, coupled to the memory, configured to: receive anindication of parameters that a base station uses for estimating TRsubcarriers, based at least in part on energies of data symbols of acommunication, having tone reservation applied for the communication;and transmit the communication having the tone reservation applied tothe TR subcarriers.

In some aspects, a non-transitory computer-readable medium stores a setof instructions for wireless communication includes one or moreinstructions that, when executed by one or more processors of a basestation, cause the base station to: transmit an indication of parametersfor estimating TR subcarriers, based at least in part on energies ofdata symbols of a communication, having tone reservation applied for thecommunication; and transmit the communication having the tonereservation applied to the TR subcarriers.

In some aspects, a non-transitory computer-readable medium stores a setof instructions for wireless communication includes one or moreinstructions that, when executed by one or more processors of a basestation, cause the base station to: transmit an indication of parametersthat the base station uses for estimating TR subcarriers, based at leastin part on energies of data symbols of a communication, having tonereservation applied for the communication; and receive the communicationhaving the tone reservation applied to the TR subcarriers.

In some aspects, a non-transitory computer-readable medium stores a setof instructions for wireless communication includes one or moreinstructions that, when executed by one or more processors of a UE,cause the UE to: receive an indication of parameters for estimating TRsubcarriers, based at least in part on energies of data symbols of acommunication, having tone reservation applied for the communication;and receive the communication having the tone reservation applied to theTR subcarriers.

In some aspects, a non-transitory computer-readable medium stores a setof instructions for wireless communication includes one or moreinstructions that, when executed by one or more processors of a UE,cause the UE to: receive an indication of parameters that a base stationuses for estimating TR subcarriers, based at least in part on energiesof data symbols of a communication, having tone reservation applied forthe communication; and transmit the communication having the tonereservation applied to the TR subcarriers.

In some aspects, an apparatus for wireless communication includes meansfor transmitting an indication of parameters for estimating TRsubcarriers, based at least in part on energies of data symbols of acommunication, having tone reservation applied for the communication;and means for transmitting the communication having the tone reservationapplied to the TR subcarriers.

In some aspects, an apparatus for wireless communication includes meansfor transmitting an indication of parameters that the apparatus uses forestimating TR subcarriers, based at least in part on energies of datasymbols of a communication, having tone reservation applied for thecommunication; and means for receiving the communication having the tonereservation applied to the TR subcarriers.

In some aspects, an apparatus for wireless communication includes meansfor receiving an indication of parameters for estimating TR subcarriers,based at least in part on energies of data symbols of a communication,having tone reservation applied for the communication; and means forreceiving the communication having the tone reservation applied to theTR subcarriers.

In some aspects, an apparatus for wireless communication includes meansfor receiving an indication of parameters that a base station uses forestimating TR subcarriers, based at least in part on energies of datasymbols of a communication, having tone reservation applied for thecommunication; and means for transmitting the communication having thetone reservation applied to the TR subcarriers.

Aspects generally include a method, apparatus, system, computer programproduct, non-transitory computer-readable medium, user equipment, basestation, wireless communication device, and/or processing system assubstantially described herein with reference to and as illustrated bythe drawings and specification.

The foregoing has outlined rather broadly the features and technicaladvantages of examples according to the disclosure in order that thedetailed description that follows may be better understood. Additionalfeatures and advantages will be described hereinafter. The conceptionand specific examples disclosed may be readily utilized as a basis formodifying or designing other structures for carrying out the samepurposes of the present disclosure. Such equivalent constructions do notdepart from the scope of the appended claims. Characteristics of theconcepts disclosed herein, both their organization and method ofoperation, together with associated advantages will be better understoodfrom the following description when considered in connection with theaccompanying figures. Each of the figures is provided for the purposesof illustration and description, and not as a definition of the limitsof the claims.

While aspects are described in the present disclosure by illustration tosome examples, those skilled in the art will understand that suchaspects may be implemented in many different arrangements and scenarios.Techniques described herein may be implemented using different platformtypes, devices, systems, shapes, sizes, and/or packaging arrangements.For example, some aspects may be implemented via integrated chipembodiments or other non-module-component based devices (e.g., end-userdevices, vehicles, communication devices, computing devices, industrialequipment, retail/purchasing devices, medical devices, or artificialintelligence-enabled devices). Aspects may be implemented in chip-levelcomponents, modular components, non-modular components, non-chip-levelcomponents, device-level components, or system-level components. Devicesincorporating described aspects and features may include additionalcomponents and features for implementation and practice of claimed anddescribed aspects. For example, transmission and reception of wirelesssignals may include a number of components for analog and digitalpurposes (e.g., hardware components including antenna, radio frequency(RF) chains, power amplifiers, modulators, buffer, processor(s),interleaver, adders, or summers). It is intended that aspects describedherein may be practiced in a wide variety of devices, components,systems, distributed arrangements, or end-user devices of varying size,shape, and constitution.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can beunderstood in detail, a more particular description, briefly summarizedabove, may be had by reference to aspects, some of which are illustratedin the appended drawings. It is to be noted, however, that the appendeddrawings illustrate only certain typical aspects of this disclosure andare therefore not to be considered limiting of its scope, for thedescription may admit to other equally effective aspects. The samereference numbers in different drawings may identify the same or similarelements.

FIG. 1 is a diagram illustrating an example of a wireless network, inaccordance with the present disclosure.

FIG. 2 is a diagram illustrating an example of a base station incommunication with a user equipment (UE) in a wireless network, inaccordance with the present disclosure.

FIG. 3 is a diagram illustrating an example of tone reservation, inaccordance with the present disclosure.

FIGS. 4-7 are diagrams illustrating examples associated with data aidedchannel oriented tone reservation, in accordance with the presentdisclosure.

FIGS. 8-11 are diagrams illustrating example processes associated withdata aided channel oriented tone reservation, in accordance with thepresent disclosure.

FIGS. 12 and 13 are block diagrams of example apparatuses for wirelesscommunication, in accordance with the present disclosure.

DETAILED DESCRIPTION

Tone reservation (TR) (e.g., foregoing transmission of data on one ormore subcarriers of a communication and/or transmitting a signal toimprove a peak-to-average-power ratio (PAPR) of the communication on theone or more subcarriers, among other examples) may be used by atransmitting device to improve PAPR of a communication to a receivingdevice. This may improve a likelihood of decoding and/or demodulatingthe communication by the receiving device. Tone reservation may beapplied to fixed subcarriers, which reduces throughput on thecommunication and may replace data on high-energy subcarriers that havea relatively high likelihood of being decoded and demodulated by thereceiving device. Alternatively, tone reservation may be applied tosubcarriers that are based at least in part on energies of thesubcarriers as expected to be received by the receiving device (e.g.,using low energy subcarriers). However, signaling for use of tonereservation may consume resources as overhead, which may decreasethroughput and/or spectral efficiency.

In some aspects described herein, a transmitting device (e.g., a basestation or a user equipment (UE), among other examples) may transmit anindication that tone reservation is to be applied to one or moresubcarriers for a communication, and a receiving device (e.g., a UE or abase station, among other examples) may receive the indication. Theindication may provide parameters for estimating TR subcarriers havingtone reservation applied for the communication based at least in part onenergies of data symbols of the communication. The transmitting devicemay select the TR subcarriers based at least in part on an estimate of achannel response at the receiving device (e.g., may select TRsubcarriers as the lowest energy subcarriers of the communication asobserved at the receiving device). The receiving device may estimate theTR subcarriers (e.g., attempt to identify the TR subcarriers) based atleast in part on energies of subcarriers of the communication, with theenergies determined using data symbols of the communication. Based atleast in part on determining the energies of the subcarriers using datasymbols of the communication, the receiving device may identify the TRsubcarriers with improved accuracy when compared with using onlydemodulation reference signals, which may be transmitted on only somesubcarriers of the communication.

Various aspects of the disclosure are described more fully hereinafterwith reference to the accompanying drawings. This disclosure may,however, be embodied in many different forms and should not be construedas limited to any specific structure or function presented throughoutthis disclosure. Rather, these aspects are provided so that thisdisclosure will be thorough and complete, and will fully convey thescope of the disclosure to those skilled in the art. Based on theteachings herein, one skilled in the art should appreciate that thescope of the disclosure is intended to cover any aspect of thedisclosure disclosed herein, whether implemented independently of orcombined with any other aspect of the disclosure. For example, anapparatus may be implemented or a method may be practiced using anynumber of the aspects set forth herein. In addition, the scope of thedisclosure is intended to cover such an apparatus or method which ispracticed using other structure, functionality, or structure andfunctionality in addition to or other than the various aspects of thedisclosure set forth herein. It should be understood that any aspect ofthe disclosure disclosed herein may be embodied by one or more elementsof a claim.

Several aspects of telecommunication systems will now be presented withreference to various apparatuses and techniques. These apparatuses andtechniques will be described in the following detailed description andillustrated in the accompanying drawings by various blocks, modules,components, circuits, steps, processes, algorithms, or the like(collectively referred to as “elements”). These elements may beimplemented using hardware, software, or combinations thereof. Whethersuch elements are implemented as hardware or software depends upon theparticular application and design constraints imposed on the overallsystem.

It should be noted that while aspects may be described herein usingterminology commonly associated with a 5G or NR radio access technology(RAT), aspects of the present disclosure can be applied to other RATs,such as a 3G RAT, a 4G RAT, and/or a RAT subsequent to 5G (e.g., 6G).

FIG. 1 is a diagram illustrating an example of a wireless network 100,in accordance with the present disclosure. The wireless network 100 maybe or may include elements of a 5G (NR) network and/or an LTE network,among other examples. The wireless network 100 may include a number ofbase stations 110 (shown as BS 110 a, BS 110 b, BS 110 c, and BS 110 d)and other network entities. A base station (BS) is an entity thatcommunicates with UEs and may also be referred to as an NR BS, a Node B,a gNB, a 5G node B (NB), an access point, a transmit receive point(TRP), or the like. Each BS may provide communication coverage for aparticular geographic area. In 3GPP, the term “cell” can refer to acoverage area of a BS and/or a BS subsystem serving this coverage area,depending on the context in which the term is used.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, and/or another type of cell. A macro cell may cover arelatively large geographic area (e.g., several kilometers in radius)and may allow unrestricted access by UEs with service subscription. Apico cell may cover a relatively small geographic area and may allowunrestricted access by UEs with service subscription. A femto cell maycover a relatively small geographic area (e.g., a home) and may allowrestricted access by UEs having association with the femto cell (e.g.,UEs in a closed subscriber group (CSG)). ABS for a macro cell may bereferred to as a macro BS. ABS for a pico cell may be referred to as apico BS. A BS for a femto cell may be referred to as a femto BS or ahome BS. In the example shown in FIG. 1 , a BS 110 a may be a macro BSfor a macro cell 102 a, a BS 110 b may be a pico BS for a pico cell 102b, and a BS 110 c may be a femto BS for a femto cell 102 c. A BS maysupport one or multiple (e.g., three) cells. The terms “eNB”, “basestation”, “NR BS”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” maybe used interchangeably herein.

In some aspects, a cell may not necessarily be stationary, and thegeographic area of the cell may move according to the location of amobile BS. In some aspects, the BSs may be interconnected to one anotherand/or to one or more other BSs or network nodes (not shown) in thewireless network 100 through various types of backhaul interfaces, suchas a direct physical connection or a virtual network, using any suitabletransport network.

Wireless network 100 may also include relay stations. A relay station isan entity that can receive a transmission of data from an upstreamstation (e.g., a BS or a UE) and send a transmission of the data to adownstream station (e.g., a UE or a BS). A relay station may also be aUE that can relay transmissions for other UEs. In the example shown inFIG. 1 , a relay BS 110 d may communicate with macro BS 110 a and a UE120 d in order to facilitate communication between BS 110 a and UE 120d. A relay BS may also be referred to as a relay station, a relay basestation, a relay, or the like.

Wireless network 100 may be a heterogeneous network that includes BSs ofdifferent types, such as macro BSs, pico BSs, femto BSs, relay BSs, orthe like. These different types of BSs may have different transmit powerlevels, different coverage areas, and different impacts on interferencein wireless network 100. For example, macro BSs may have a high transmitpower level (e.g., 5 to 40 watts) whereas pico BSs, femto BSs, and relayBSs may have lower transmit power levels (e.g., 0.1 to 2 watts).

A network controller 130 may couple to a set of BSs and may providecoordination and control for these BSs. Network controller 130 maycommunicate with the BSs via a backhaul. The BSs may also communicatewith one another, e.g., directly or indirectly via a wireless orwireline backhaul.

UEs 120 (e.g., 120a, 120 b, 120 c) may be dispersed throughout wirelessnetwork 100, and each UE may be stationary or mobile. A UE may also bereferred to as an access terminal, a terminal, a mobile station, asubscriber unit, a station, or the like. A UE may be a cellular phone(e.g., a smart phone), a personal digital assistant (PDA), a wirelessmodem, a wireless communication device, a handheld device, a laptopcomputer, a cordless phone, a wireless local loop (WLL) station, atablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook,a medical device or equipment, biometric sensors/devices, wearabledevices (smart watches, smart clothing, smart glasses, smart wristbands, smart jewelry (e.g., smart ring, smart bracelet)), anentertainment device (e.g., a music or video device, or a satelliteradio), a vehicular component or sensor, smart meters/sensors,industrial manufacturing equipment, a global positioning system device,or any other suitable device that is configured to communicate via awireless or wired medium.

Some UEs may be considered machine-type communication (MTC) or evolvedor enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEsinclude, for example, robots, drones, remote devices, sensors, meters,monitors, and/or location tags, that may communicate with a basestation, another device (e.g., remote device), or some other entity. Awireless node may provide, for example, connectivity for or to a network(e.g., a wide area network such as Internet or a cellular network) via awired or wireless communication link. Some UEs may be consideredInternet-of-Things (IoT) devices, and/or may be implemented as NB-IoT(narrowband internet of things) devices. Some UEs may be considered aCustomer Premises Equipment (CPE). UE 120 may be included inside ahousing that houses components of UE 120, such as processor componentsand/or memory components. In some aspects, the processor components andthe memory components may be coupled together. For example, theprocessor components (e.g., one or more processors) and the memorycomponents (e.g., a memory) may be operatively coupled, communicativelycoupled, electronically coupled, and/or electrically coupled.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular RAT andmay operate on one or more frequencies. A RAT may also be referred to asa radio technology, an air interface, or the like. A frequency may alsobe referred to as a carrier, a frequency channel, or the like. Eachfrequency may support a single RAT in a given geographic area in orderto avoid interference between wireless networks of different RATs. Insome cases, NR or 5G RAT networks may be deployed.

In some aspects, two or more UEs 120 (e.g., shown as UE 120 a and UE 120e) may communicate directly using one or more sidelink channels (e.g.,without using a base station 110 as an intermediary to communicate withone another). For example, the UEs 120 may communicate usingpeer-to-peer (P2P) communications, device-to-device (D2D)communications, a vehicle-to-everything (V2X) protocol (e.g., which mayinclude a vehicle-to-vehicle (V2V) protocol or avehicle-to-infrastructure (V2I) protocol), and/or a mesh network. Inthis case, the UE 120 may perform scheduling operations, resourceselection operations, and/or other operations described elsewhere hereinas being performed by the base station 110.

Devices of wireless network 100 may communicate using theelectromagnetic spectrum, which may be subdivided based on frequency orwavelength into various classes, bands, channels, or the like. Forexample, devices of wireless network 100 may communicate using anoperating band having a first frequency range (FR1), which may span from410 MHz to 7.125 GHz, and/or may communicate using an operating bandhaving a second frequency range (FR2), which may span from 24.25 GHz to52.6 GHz. The frequencies between FR1 and FR2 are sometimes referred toas mid-band frequencies. Although a portion of FR1 is greater than 6GHz, FR1 is often referred to as a “sub-6 GHz” band. Similarly, FR2 isoften referred to as a “millimeter wave” band despite being differentfrom the extremely high frequency (EHF) band (30 GHz-300 GHz) which isidentified by the International Telecommunications Union (ITU) as a“millimeter wave” band. Thus, unless specifically stated otherwise, itshould be understood that the term “sub-6 GHz” or the like, if usedherein, may broadly represent frequencies less than 6 GHz, frequencieswithin FR1, and/or mid-band frequencies (e.g., greater than 7.125 GHz).Similarly, unless specifically stated otherwise, it should be understoodthat the term “millimeter wave” or the like, if used herein, may broadlyrepresent frequencies within the EHF band, frequencies within FR2,and/or mid-band frequencies (e.g., less than 24.25 GHz). It iscontemplated that the frequencies included in FR1 and FR2 may bemodified, and techniques described herein are applicable to thosemodified frequency ranges.

In some aspects, the base station 110 may include a communicationmanager 150. As described in more detail elsewhere herein, thecommunication manager 150 may transmit an indication of parameters forestimating TR subcarriers, based at least in part on energies of datasymbols of a communication, having tone reservation applied for thecommunication; and transmit the communication having the tonereservation applied to the TR subcarriers. In some aspects, thecommunication manager 150 may transmit an indication of parameters thatthe base station uses for estimating TR subcarriers, based at least inpart on energies of data symbols of a communication, having tonereservation applied for the communication; and receive the communicationhaving the tone reservation applied to the TR subcarriers. Additionally,or alternatively, the communication manager 150 may perform one or moreother operations described herein.

In some aspects, the UE 120 may include a communication manager 140. Asdescribed in more detail elsewhere herein, the communication manager 140may receive an indication of parameters for estimating TR subcarriers,based at least in part on energies of data symbols of a communication,having tone reservation applied for the communication; and receive thecommunication having the tone reservation applied to the TR subcarriers.In some aspects, the communication manager 140 may receive an indicationof parameters that a base station uses for estimating TR subcarriers,based at least in part on energies of data symbols of a communication,having tone reservation applied for the communication; and transmit thecommunication having the tone reservation applied to the TR subcarriers.Additionally, or alternatively, the communication manager 140 mayperform one or more other operations described herein.

As indicated above, FIG. 1 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 1 .

FIG. 2 is a diagram illustrating an example 200 of a base station 110 incommunication with a UE 120 in a wireless network 100, in accordancewith the present disclosure. Base station 110 may be equipped with Tantennas 234 a through 234 t, and UE 120 may be equipped with R antennas252 a through 252 r, where in general T≥1 and R≥1.

At base station 110, a transmit processor 220 may receive data from adata source 212 for one or more UEs, select one or more modulation andcoding schemes (MCS) for each UE based at least in part on channelquality indicators (CQIs) received from the UE, process (e.g., encodeand modulate) the data for each UE based at least in part on the MCS(s)selected for the UE, and provide data symbols for all UEs. Transmitprocessor 220 may also process system information (e.g., for semi-staticresource partitioning information (SRPI)) and control information (e.g.,CQI requests, grants, and/or upper layer signaling) and provide overheadsymbols and control symbols. Transmit processor 220 may also generatereference symbols for reference signals (e.g., a cell-specific referencesignal (CRS) or a demodulation reference signal (DMRS)) andsynchronization signals (e.g., a primary synchronization signal (PSS) ora secondary synchronization signal (SSS)). A transmit (TX)multiple-input multiple-output (MIMO) processor 230 may perform spatialprocessing (e.g., precoding) on the data symbols, the control symbols,the overhead symbols, and/or the reference symbols, if applicable, andmay provide T output symbol streams to T modulators (MODs) 232 a through232 t. Each modulator 232 may process a respective output symbol stream(e.g., for OFDM) to obtain an output sample stream. Each modulator 232may further process (e.g., convert to analog, amplify, filter, andupconvert) the output sample stream to obtain a downlink signal. Tdownlink signals from modulators 232 a through 232 t may be transmittedvia T antennas 234 a through 234 t, respectively.

At UE 120, antennas 252 a through 252 r may receive the downlink signalsfrom base station 110 and/or other base stations and may providereceived signals to demodulators (DEMODs) 254 a through 254 r,respectively. Each demodulator 254 may condition (e.g., filter, amplify,downconvert, and digitize) a received signal to obtain input samples.Each demodulator 254 may further process the input samples (e.g., forOFDM) to obtain received symbols. A MIMO detector 256 may obtainreceived symbols from all R demodulators 254 a through 254 r, performMIMO detection on the received symbols if applicable, and providedetected symbols. A receive processor 258 may process (e.g., demodulateand decode) the detected symbols, provide decoded data for UE 120 to adata sink 260, and provide decoded control information and systeminformation to a controller/processor 280. The term“controller/processor” may refer to one or more controllers, one or moreprocessors, or a combination thereof. A channel processor may determinea reference signal received power (RSRP) parameter, a received signalstrength indicator (RSSI) parameter, a reference signal received quality(RSRQ) parameter, and/or a CQI parameter, among other examples. In someaspects, one or more components of UE 120 may be included in a housing284.

Network controller 130 may include communication unit 294,controller/processor 290, and memory 292. Network controller 130 mayinclude, for example, one or more devices in a core network. Networkcontroller 130 may communicate with base station 110 via communicationunit 294.

Antennas (e.g., antennas 234 a through 234 t and/or antennas 252 athrough 252 r) may include, or may be included within, one or moreantenna panels, antenna groups, sets of antenna elements, and/or antennaarrays, among other examples. An antenna panel, an antenna group, a setof antenna elements, and/or an antenna array may include one or moreantenna elements. An antenna panel, an antenna group, a set of antennaelements, and/or an antenna array may include a set of coplanar antennaelements and/or a set of non-coplanar antenna elements. An antennapanel, an antenna group, a set of antenna elements, and/or an antennaarray may include antenna elements within a single housing and/orantenna elements within multiple housings. An antenna panel, an antennagroup, a set of antenna elements, and/or an antenna array may includeone or more antenna elements coupled to one or more transmission and/orreception components, such as one or more components of FIG. 2 .

On the uplink, at UE 120, a transmit processor 264 may receive andprocess data from a data source 262 and control information (e.g., forreports that include RSRP, RSSI, RSRQ, and/or CQI) fromcontroller/processor 280. Transmit processor 264 may also generatereference symbols for one or more reference signals. The symbols fromtransmit processor 264 may be precoded by a TX MIMO processor 266 ifapplicable, further processed by modulators 254 a through 254 r (e.g.,for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In someaspects, a modulator and a demodulator (e.g., MOD/DEMOD 254) of the UE120 may be included in a modem of the UE 120. In some aspects, the UE120 includes a transceiver. The transceiver may include any combinationof antenna(s) 252, modulators and/or demodulators 254, MIMO detector256, receive processor 258, transmit processor 264, and/or TX MIMOprocessor 266. The transceiver may be used by a processor (e.g.,controller/processor 280) and memory 282 to perform aspects of any ofthe methods described herein, for example, as described with referenceto FIGS. 4-11 .

At base station 110, the uplink signals from UE 120 and other UEs may bereceived by antennas 234, processed by demodulators 232, detected by aMIMO detector 236 if applicable, and further processed by a receiveprocessor 238 to obtain decoded data and control information sent by UE120. Receive processor 238 may provide the decoded data to a data sink239 and the decoded control information to controller/processor 240.Base station 110 may include communication unit 244 and communicate tonetwork controller 130 via communication unit 244. Base station 110 mayinclude a scheduler 246 to schedule UEs 120 for downlink and/or uplinkcommunications. In some aspects, a modulator and a demodulator (e.g.,MOD/DEMOD 232) of the base station 110 may be included in a modem of thebase station 110. In some aspects, the base station 110 includes atransceiver. The transceiver may include any combination of antenna(s)234, modulators and/or demodulators 232, MIMO detector 236, receiveprocessor 238, transmit processor 220, and/or TX MIMO processor 230. Thetransceiver may be used by a processor (e.g., controller/processor 240)and memory 242 to perform aspects of any of the methods describedherein, for example, as described with reference to FIGS. 4-11 .

Controller/processor 240 of base station 110, controller/processor 280of UE 120, and/or any other component(s) of FIG. 2 may perform one ormore techniques associated with data aided channel oriented tonereservation, as described in more detail elsewhere herein. For example,controller/processor 240 of base station 110, controller/processor 280of UE 120, and/or any other component(s) of FIG. 2 may perform or directoperations of, for example, process 800 of FIG. 8 , process 900 of FIG.9 , process 1000 of FIG. 10 , process 1100 of FIG. 11 , and/or otherprocesses as described herein. Memories 242 and 282 may store data andprogram codes for base station 110 and UE 120, respectively.

In some aspects, memory 242 and/or memory 282 may include anon-transitory computer-readable medium storing one or more instructions(e.g., code and/or program code) for wireless communication. Forexample, the one or more instructions, when executed (e.g., directly, orafter compiling, converting, and/or interpreting) by one or moreprocessors of the base station 110 and/or the UE 120, may cause the oneor more processors, the UE 120, and/or the base station 110 to performor direct operations of, for example, process 800 of FIG. 8 , process900 of FIG. 9 , process 1000 of FIG. 10 , process 1100 of FIG. 11 ,and/or other processes as described herein. In some aspects, executinginstructions may include running the instructions, converting theinstructions, compiling the instructions, and/or interpreting theinstructions, among other examples.

In some aspects, the base station includes means for transmitting anindication of parameters for estimating TR subcarriers, based at leastin part on energies of data symbols of a communication, having tonereservation applied for the communication; and/or means for transmittingthe communication having the tone reservation applied to the TRsubcarriers. In some aspects, the base station includes means fortransmitting an indication of parameters that the apparatus uses forestimating TR subcarriers, based at least in part on energies of datasymbols of a communication, having tone reservation applied for thecommunication; and/or means for receiving the communication having thetone reservation applied to the TR subcarriers. The means for the basestation to perform operations described herein may include, for example,one or more of communication manager 150, transmit processor 220, TXMIMO processor 230, modulator 232, antenna 234, demodulator 232, MIMOdetector 236, receive processor 238, controller/processor 240, memory242, or scheduler 246.

In some aspects, the UE includes means for receiving an indication ofparameters for estimating TR subcarriers, based at least in part onenergies of data symbols of a communication, having tone reservationapplied for the communication; and/or means for receiving thecommunication having the tone reservation applied to the TR subcarriers.In some aspects, the UE includes means for receiving an indication ofparameters that a base station uses for estimating TR subcarriers, basedat least in part on energies of data symbols of a communication, havingtone reservation applied for the communication; and/or means fortransmitting the communication having the tone reservation applied tothe TR subcarriers. The means for the UE to perform operations describedherein may include, for example, one or more of communication manager140, antenna 252, demodulator 254, MIMO detector 256, receive processor258, transmit processor 264, TX MIMO processor 266, modulator 254,controller/processor 280, or memory 282.

While blocks in FIG. 2 are illustrated as distinct components, thefunctions described above with respect to the blocks may be implementedin a single hardware, software, or combination component or in variouscombinations of components. For example, the functions described withrespect to the transmit processor 264, the receive processor 258, and/orthe TX MIMO processor 266 may be performed by or under the control ofcontroller/processor 280.

As indicated above, FIG. 2 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 2 .

FIG. 3 is a diagram illustrating an example 300 of UE subcarrier tonereservation on one or more subcarriers, in accordance with the presentdisclosure. In some networks, a base station may transmit a downlinktransmission on a physical downlink shared channel (PDSCH) with tonereservation on one or more subcarriers based at least in part onmeasurement(s) of uplink signals from a UE, a request from the UE, anindication of a capability of the UE, and/or an independentdetermination by the base station, among other examples (e.g., asdescribed herein).

In some aspects, the UE may be configured to communicate with the basestation with a configuration for tone reservation. For example, theconfiguration may be common for multiple communications (e.g., for aconfigured grant and/or semi-persistent scheduling resources), multipleUEs connected to the base station, a beam provided by the base station,a cell provided by the base station, and/or the like.

As shown by example 300, a PDSCH may include one or more reservedsubcarriers (e.g., tones) on which data and/or pilots are not to betransmitted. In some aspects, the subcarriers may be empty (e.g., nothaving any information intended for transmission to the UE).Additionally, or alternatively, tone reservation may be applied tophysical downlink control channel (PDCCH) symbols (e.g., symbols 0 and 1in FIG. 3 ). In some aspects, a pilot may include or may be a referencesignal. In some aspects, the base station may transmit a signal that isconfigured to improve a PAPR for a downlink transmission on the PDSCH byusing tone reservation to forego transmission of data and/or pilots onthe one or more reserved subcarriers. While example 300 provides anexample of tone reservation applied to PDSCH and/or PDCCH, in someaspects (e.g., when a UE applies tone reservation to uplinkcommunications transmitted to a base station), tone reservation may beapplied to physical uplink shared channel (PUSCH) and/or physical uplinkcontrol channel (PUCCH) symbols.

Signaling for use of tone reservation may consume resources as overhead,which may decrease throughput and/or spectral efficiency. For example,to enable the UE to identify which subcarriers have tone reservationapplied, the base station may indicate the frequency locations (e.g.,using indices) of the subcarriers to the UE. These indications mayconsume communication, network, and power resources. Additionally, oralternatively, consumption of network resources for the indications maydecrease throughput available for data (e.g., associated with thePDSCH). In a communication where tone reservation is not used, anincrease in PAPR may occur, which may degrade communications between thebase station and the UE, and may negatively affect an efficiency ofpower amplification at the base station. Based at least in part ondegradation of the communications, the UE and/or the base station mayconsume power, communication, network, and computing resources to detectand/or correct communication errors associated with the degradation.

As indicated above, FIG. 3 is provided as an example. Other examples maydiffer from what is described with respect to FIG. 3 .

In some aspects described herein, a transmitting device (e.g., a basestation or a UE, among other examples) may transmit an indication thattone reservation is to be applied to one or more subcarriers for acommunication, and a receiving device (e.g., a UE or a base station,among other examples) may receive the indication. The indication mayprovide parameters for estimating TR subcarriers having tone reservationapplied for the communication based at least in part on energies of datasymbols of the communication. The transmitting device may select the TRsubcarriers based at least in part on an estimate of a channel responseat the receiving device (e.g., may select TR subcarriers as the lowestenergy subcarriers of the communication as observed at the receivingdevice). The receiving device may estimate the TR subcarriers (e.g.,attempt to identify the TR subcarriers) based at least in part onenergies of subcarriers of the communication, with the energiesdetermined using data symbols of the communication. Based at least inpart on determining the energies of the subcarriers using data symbolsof the communication, the receiving device may identify the TRsubcarriers with improved accuracy when compared with using onlydemodulation reference signals, which may be transmitted on only somesubcarriers of the communication.

In some aspects, the transmitting device may apply a mask to the TRsubcarriers to improve the PAPR and/or to improve a likelihood of thereceiving device correctly identifying the TR subcarriers. For example,the transmitting device may boost a power (e.g., an energy for thecommunication) of lowest-energy subcarriers of the TR subcarriers and/ormay de-boost a power of highest-energy subcarriers of the TRsubcarriers. In this way, an average power and/or energy of the TRsubcarriers may be increased and/or highest-energy subcarriers may havean increased energy gap separating the TR subcarriers from data-carryingsubcarriers for improved accuracy for identifying the TR subcarriers.

In this way, the base station and UE may communicate using tonereservation without the need to transmit reports to identify subcarriersto which tone reservation is to be applied. This may reduce overheadassociated with the use of tone reservation by obviating the need totransmit reports for tone reservation, which may increase throughputbetween the UE and base station. In addition, application of tonereservation may lead to improved PAPR, which may conserve resources thatthe UE uses to receive (e.g., demodulate and/or decode) the downlinktransmission and may also lead to improved efficiency of poweramplification at the base station (e.g., by conserving power that wouldotherwise be used to transmit signals using the reserved subcarriers).

FIG. 4 is a diagram illustrating an example 400 associated with dataaided channel oriented tone reservation, in accordance with the presentdisclosure. As shown in FIG. 4 , a base station (e.g., base station 110)may communicate with a UE (e.g., UE 120). In some aspects, the basestation and the UE may be part of a wireless network (e.g., wirelessnetwork 100). As shown in FIG. 4 , the base station may apply tonereservation for downlink communications.

As shown by reference number 405, the base station may transmit, and theUE may receive, configuration information. In some aspects, the UE mayreceive the configuration information via one or more of radio resourcecontrol (RRC) signaling, medium access control (MAC) control elements(CEs) (MAC CEs), and/or downlink control information (DCI), among otherexamples. In some aspects, the configuration information may include anindication of one or more configuration parameters (e.g., already knownto the UE) for selection by the UE, and/or explicit configurationinformation for the UE to use to configure the UE, among other examples.

In some aspects, the configuration information may indicate that the UEis to transmit an indication of UE capability (e.g., UE support) toreceive one or more downlink communications having tone reservationapplied based at least in part on a downlink channel. In some aspects,the configuration information may indicate that the UE is to receive anindication that tone reservation is to be applied to one or more TRsubcarriers for one or more downlink communications. For example, theconfiguration information may indicate that the UE is to receive theindication via RRC signaling, MAC signaling, and/or DCI, among otherexamples. In some aspects, the indication may include an indication of anumber of subcarriers to which tone reservation is to be applied, afraction of subcarriers to which tone reservation is to be applied,and/or a threshold power for subcarriers to which tone reservation is tobe applied. In some aspects, the configuration information may indicatethat the UE is to transmit one or more uplink signals (e.g., soundingreference signals), using the one or more TR subcarriers (e.g., usingsubcarriers the same frequency ranges as the one or more TRsubcarriers), for measurement by the base station. In some aspects, theconfiguration information may indicate that the UE is to transmit anindication of a measurement of one or moresignal-to-interference-plus-noise ratios (SINRs) based at least in parton reception of one or more downlink reference signals. In some aspects,the configuration information may indicate that the UE is to determine achannel response of the one or more downlink communications (e.g., basedat least on part on data symbols of the one or more downlinkcommunications) and generate a set of estimated indices of the one ormore TR subcarriers having tone reservation applied based at least inpart on received energy (e.g., power) on the one or more TR subcarriers.For example, the configuration information may indicate that the UE isto generate the set of estimated indices to include indices for one ormore TR subcarriers having a lowest received energy of subcarriers ofthe one or more downlink communications.

In some aspects, the configuration information may indicate that the UEis to decode the one or more downlink communications based at least inpart on discarding samples measured on the one or more TR subcarriers(e.g., zeroing out log likelihood ratios (LLRs) for the one or more TRsubcarriers) and/or rate match the communication.

As shown by reference number 410, the UE may configure the UE based atleast in part on the configuration information. In some aspects, the UEmay be configured to perform one or more operations described hereinbased at least in part on the configuration information.

As shown by reference number 415, the UE may transmit, and the basestation may receive, an indication of a UE capability to receivedownlink communications having tone reservation applied (e.g., based atleast in part on a downlink channel) and/or to use data symbols toestimate locations of TR subcarriers. In some aspects, the UE maytransmit the indication as part of an RRC configuration process. Forexample, the UE may transmit the indication in connection with a UEcapability report during or after an RRC configuration process. In someaspects, the UE capability to receive the downlink communications havingthe tone reservation applied may be based at least in part on aconfiguration of the UE, components of the UE, and/or availability ofresources of the UE that may be used to determine subchannels to whichtone reservation has been applied within a threshold amount of time. Insome aspects, the UE may further indicate a capability to useverification bits to verify a set of estimate indices.

As shown by reference number 420, the base station may transmit, and theUE may receive, one or more downlink signals, such as one or moredownlink reference signals. In some aspects, the base station maytransmit one or more channel state information reference signals(CSI-RSs) and/or one or more synchronization signal blocks (SSBs), amongother examples, for the UE to measure. The UE may measure the one ormore downlink signals to determine one or more SINRs associated with oneor more channels via which the UE receives communications from the basestation.

As shown by reference number 425, the UE may transmit, and the basestation may receive, a measurement report. In some aspects, the UE maytransmit, and the base station may receive, a measurement of one or moreSINRs that are based at least in part on reception of the one or moredownlink signals. In some aspects, the base station may determinewhether to use tone reservation for subsequent downlink communicationsbased at least in part on the measurement report. For example, the basestation may determine to use tone reservation based at least in part ona relatively low SINR (e.g., less than or equal to a threshold) and/ormay determine to not use tone reservation based at least in part on arelatively high SINR (e.g., greater than or equal to a threshold). Insome aspects, the base station may determine an amount (e.g., a level ora degree) of tone reservation to apply based at least in part on themeasurement report. For example, the base station may determine a numberof subcarriers to which tone reservation is to be applied, a fraction ofsubcarriers to which tone reservation is to be applied, or a thresholdpower for subcarriers to which tone reservation is to be applied basedat least in part on the one or more SINRs indicated in the measurementreport.

As shown by reference number 430, the base station may transmit, and theUE may receive, an indication that tone reservation is to be applied toone or more TR subcarriers for one or more downlink communicationsand/or that the UE is to use data symbols to estimate locations of theone or more TR subcarriers.

In some aspects, the indication that tone reservation is to be appliedmay include an indication of a number of subcarriers to which tonereservation is to be applied, a fraction (e.g., percentage) ofsubcarriers to which tone reservation is to be applied, and/or athreshold power for subcarriers to which tone reservation is to beapplied, among other examples. For example, the indication may includeinformation that indicates that the N subcarriers with the lowest energyand/or power (e.g., based on signal-to-noise ratio (SNR) measurements,SINR measurements, and/or RSSI measurements) are to have tonereservation applied, where N is a non-negative integer (e.g., a positiveinteger). As another example, the indication may include informationthat indicates a fraction or percentage (e.g., one fourth, one tenth,5%, 10%, 20%, or the like) of subcarriers to which tone reservation isto be applied (e.g., subcarriers in the bottom fourth, tenth, 5%, 10%,20%, or the like, in energy and/or power). As yet another example, theindication may include information that indicates a threshold power(e.g., 0 dB, −5 dB, −10 dB, or the like), and that tone reservation isto be applied to subcarriers associated with uplink signals that fail tosatisfy the threshold power.

In some aspects, the indication that tone reservation is to be appliedmay include information identifying a tone reservation optimizationtechnique or formula. For example, based at least in part on the numberof subcarriers, the fraction of subcarriers, and/or the threshold powerfor subcarriers to which tone reservation is to be applied, anoptimization technique may be implemented to identify subcarriers fortone reservation in a manner that optimizes PAPR with a constraint of amaximum power (e.g., transmit power) that is equal to the power used forthe PDSCH and/or PUCCH subcarrier. In some aspects, the indication mayinclude information that indicates that tone reservation optimizationtechniques are to be performed in iterations, are to be generated byapplying machine learning, are to be generated using constrained orunconstrained optimization, or are to be generated by testing hypothesisiterations, among other examples. In some aspects, the indication mayinclude information identifying a minimum tone reservation powerconstraint to be used (e.g., in a manner designed to improve UEdetection).

In some aspects, the indication that tone reservation is to be appliedmay include information identifying a PAPR threshold to be achieved bytone reservation, and may include information indicating that varioustone reservation and/or optimization techniques are to be used until thePAPR threshold is satisfied. For example, the indication may includeinformation identifying the PAPR threshold and information indicatingthat the lowest energy subcarriers are to be iteratively discarded untilthe PAPR threshold is reached (e.g., starting with discarding the lowest1% of subcarriers and incrementing by +1% until the PAPR threshold issatisfied).

As shown by reference number 435, the UE may transmit, and the basestation may receive, one or more uplink signals. In some aspects, theone or more uplink signals may be transmitted by the UE for measurementby the base station (e.g., for the base station to identify subcarriersto which tone reservation is to be applied). In some aspects, the one ormore uplink signals include one or more sounding reference signals(SRSs).

As shown by reference number 440, the base station may apply tonereservation to one or more TR subcarriers (e.g., based at least in parton received energy on the one or more uplink signals) and/or may apply amask to the one or more TR subcarriers.

In some aspects, the base station may determine channel conditions(e.g., received energy measurements, one or more SINR values, and/or oneor more PAPR values, among other examples) based at least in part on theone or more uplink signals and apply tone reservation based at least inpart on the channel conditions. In some aspects, the base station mayapply tone reservation to the one or more TR subcarriers based at leastin part on the one or more TR subcarriers having a lowest receivedenergy of subcarriers of the one or more uplink signals. In someaspects, the base station may apply tone reservation based at least inpart on receiving the indication of the measurement of one or more SINRs(e.g., the measurement report described in connection with referencenumber 425) and/or based at least in part on transmission of one or moredownlink reference signals (e.g., the downlink signals described inconnection with reference number 420).

In some aspects, the base station may apply tone reservation to a numberof subcarriers, a fraction (e.g., percentage) of subcarriers, and/orbased at least in part on a threshold power for subcarriers, among otherexamples (e.g., as described herein). In some aspects, the base stationmay apply tone reservation using a tone reservation optimizationtechnique (e.g., as described herein). In some aspects, the base stationmay apply tone reservation based at least in part on a PAPR thresholdand/or various tone reservation and/or optimization techniques to beiteratively used until the PAPR threshold is satisfied (e.g., asdescribed herein).

In some aspects, the base station may prepare a UE report indicatingwhether tone reservation is applied and indicating a number ofsubcarrier(s) (e.g., fraction or percentage) to which tone reservationis applied. In some aspects, the tone reservation frequency locations(e.g., subcarrier identifiers) and corresponding values may beidentified to a mapper, along with data and/or pilots for transmissionto the UE (e.g., using OFDM transmission protocol (e.g., inverse fastFourier transform (IFFT))). The mapper may map the data and/or pilots tosubcarriers of the channel, excluding subcarriers to which tonereservation is applied.

In some aspects, the base station may apply the mask to the TRsubcarriers to modify energies of the TR subcarriers as observed by theUE. The mask may be configured to improve a PAPR of the downlinkcommunication. For example, the base station may apply the mask to boosta tone reservation signal on a first set of TR subcarriers (e.g.,low-energy TR subcarriers) and/or de-boost a tone reservation signal ona second set of TR subcarriers (e.g., high-energy TR subcarriers). Inthis way, the mask may be configured to increase an average energy ofthe TR subcarriers as observed by the UE (e.g., to improve a PAPR of thedownlink communication) and/or may be configured to maintain and/orincrease an energy gap between the TR subcarriers and data subcarriersof the downlink communication as observed by the UE.

As shown by reference number 445, the UE may receive, and the basestation may transmit, an indication of one or more parameters forestimating the TR subcarriers. In some aspects, the base station maytransmit the indication of the one or more parameters via within DCI,such as a DCI that schedules the one or more downlink communications.

In some aspects, the one or more parameters may include that a mask isto be applied to the TR subcarriers to boost or de-boost a tonereservation signal on one or more of the TR subcarriers, that one ormore energy floors are configured for the TR subcarriers, and/or one ormore values of the one or more energy floors configured for the TRsubcarriers. The energy floor may be a threshold energy that is intendedto be satisfied (e.g., met or exceeded) by energies of the TRsubcarriers. In some aspects, the base station may configure multipleenergy floors (e.g., based at least in part on energies of datasubcarriers near an associated subset of TR subcarriers) or mayconfigure a single energy floor for all TR subcarriers of the downlinkcommunication. In this way, the UE may identify the TR subcarriers withimproved accuracy based at least in part on identifying subcarriers ofthe downlink communication that are near the one or more energy floors.

As shown by reference number 450, the base station may transmit, and theUE may receive, one or more downlink communications having the tonereservation applied to the one or more TR subcarriers. In some aspects,one or more TR subcarriers to which tone reservation is applied (e.g.,by the base station) are based at least in part on the measurement ofthe one or more uplink signals on the subcarrier(s) (e.g., as describedherein). As described above, the UE may receive an indication of theparameters for estimating the TR subcarriers along with (e.g., in a sameset of allocated resources as) the one or more downlink communications.

As shown by reference number 455, the UE may determine a channelresponse and/or estimate the one or more TR subcarriers. In someaspects, estimating the TR subcarriers includes attempting to identifythe TR subcarriers based at least in part on a channel response of achannel that carries the one or more downlink communications.

In some aspects, the UE may determine a channel response of the one ormore downlink communications to generate the set of estimated indices.For example, the UE may generate the set of estimated indices based atleast in part on received energy on the one or more TR subcarriers ofthe one or more downlink communications. In some aspects, the UE maygenerate the set of estimated indices based at least in part on theconfiguration information (e.g., described above in connection withreference number 405), and/or the indication that tone reservation is tobe applied (e.g., described above in connection with reference number430), among other examples. In some aspects, the UE may determine thechannel response based at least in part on data symbols only, or on datasymbols and DMRS symbols, of the one or more downlink communications(e.g., based at least in part on an estimation of the lowest energysubcarriers using the data symbols and/or the DMRSs).

In some aspects, the UE may generate the set of estimated indices toindicate one or more TR subcarriers having lowest received energies ofsubcarriers used for the one or more downlink communications. In someaspects, the set of estimated indices may include a number of indicesbased at least in part on information included in the indication thattone reservation is to be applied to the one or more TR subcarriers(e.g., described above in connection with reference number 430).

As shown by reference number 460, the UE may decode the one or moredownlink communications. In some aspects, the UE may decode the one ormore downlink communications based at least in part on the tonereservation being applied to the one or more TR subcarriers. In someaspects, the UE may use information included in the indication that tonereservation is to be applied to the one or more TR subcarriers (e.g.,described above in connection with reference number 430) to decode theone or more downlink communications. In some aspects, the UE may decodethe one or more downlink communications based at least in part ondiscarding signals associated with the one or more TR subcarriers towhich tone reservation was applied (e.g., zeroing out LLRs of samplesassociated with the one or more TR subcarriers).

As indicated above, FIG. 4 is provided as an example. Other examples maydiffer from what is described with respect to FIG. 4 .

FIG. 5 is a diagram illustrating an example 500 associated with dataaided channel oriented tone reservation, in accordance with the presentdisclosure. As shown in FIG. 5 , a base station (e.g., base station 110)may communicate with a UE (e.g., UE 120). In some aspects, the basestation and the UE may be part of a wireless network (e.g., wirelessnetwork 100). As shown in FIG. 5 , the UE may apply tone reservation fordownlink communications.

As shown by reference number 505, the UE may receive, and the basestation may transmit configuration information. In some aspects, the UEmay receive the configuration information via one or more of RRCsignaling, MAC CEs, and/or DCI, among other examples. In some aspects,the configuration information may include an indication of one or moreconfiguration parameters (e.g., already known to the UE) for selectionby the UE, and/or explicit configuration information for the UE to useto configure the UE, among other examples.

In some aspects, the configuration information may indicate that the UEis to receive an indication that tone reservation is to be applied toone or more TR subcarriers for one or more uplink communications. Forexample, the configuration information may indicate that the UE is toreceive the indication via RRC signaling, MAC signaling, and/or DCI,among other examples. In some aspects, the indication may include anindication of a number of subcarriers to which tone reservation is to beapplied, a fraction of subcarriers to which tone reservation is to beapplied, and/or a threshold power for subcarriers to which tonereservation is to be applied. In some aspects, the configurationinformation may indicate that the UE is to transmit one or more uplinksignals (e.g., sounding reference signals), using the one or more TRsubcarriers, for measurement by the base station. In some aspects, theconfiguration information may indicate that the UE is to determine achannel response of an uplink channel based at least in part on downlinksignals received from the base station. The configuration informationmay indicate that the UE is to apply tone reservation to the one or moreTR subcarriers.

As shown by reference number 510, the UE may configure the UE based atleast in part on the configuration information. In some aspects, the UEmay be configured to perform one or more operations described hereinbased at least in part on the configuration information.

As shown by reference number 515, the UE may transmit, and the basestation may receive, an indication of a UE capability to transmit uplinkcommunications having tone reservation applied (e.g., based at least inpart on an uplink channel). In some aspects, the UE may transmit theindication as part of an RRC configuration process. For example, the UEmay transmit the indication in connection with a UE capability reportduring or after an RRC configuration process. In some aspects, the UEcapability to transmit the uplink communications having the tonereservation applied may be based at least in part on a configuration ofthe UE, components of the UE, and/or availability of resources of the UEthat may be used to determine the one or more TR subcarriers, within athreshold amount of time, to which tone reservation is to be applied.

As shown by reference number 520, the UE may transmit, and the basestation may receive, one or more uplink signals. In some aspects, theone or more uplink signals may be transmitted by the UE for measurementby the base station (e.g., to enable the base station to determinewhether tone reservation is to be applied to uplink communicationsand/or to generate a measurement report for transmission to the basestation, among other examples). In some aspects, the one or more uplinksignals include one or more SRSs.

As shown by reference number 525, the base station may transmit, and theUE may receive, a measurement report. In some aspects, the base stationmay transmit a measurement of one or more SINRs that are based at leastin part on reception of the one or more uplink signals. In some aspects,the UE may determine an amount (e.g., a level or a degree) of tonereservation to apply and/or may identify the one or more TR subcarriersbased at least in part on the measurement report. For example, the basestation may determine a number of subcarriers to which tone reservationis to be applied, a fraction of subcarriers to which tone reservation isto be applied, or a threshold power for subcarriers to which tonereservation is to be applied based at least in part on the one or moreSINRs indicated in the measurement report.

As shown by reference number 530, the base station may transmit, and theUE may receive, an indication that tone reservation is to be applied toone or more TR subcarriers for one or more uplink communications. Insome aspects, the UE may receive the indication (e.g., MAC CE with aslot offset between a downlink allocation and corresponding data (KO)greater than or equal to 0) via RRC signaling, MAC signaling, and/orDCI, among other examples. In some aspects, the indication that tonereservation is to be applied to the one or more TR subcarriers mayfurther indicate that the base station is to use data symbols toestimate the one or more TR subcarriers for the one or more uplinkcommunications.

In some aspects, the indication that tone reservation is to be appliedto one or more TR subcarriers for one or more uplink communications mayhave one or more characteristics in common with the indication that tonereservation is to be applied to one or more TR subcarriers for one ormore downlink communications described in connection with referencenumber 430 of FIG. 4 .

As shown by reference number 535, the UE may receive, and the basestation may transmit, one or more downlink signals. In some aspects, theone or more downlink signals may be transmitted by the base station formeasurement by the UE (e.g., to enable the UE to identify subcarriers towhich tone reservation is to be applied). In some aspects, the one ormore downlink signals may include one or more CSI-RSs, SSBs, or datachannel signaling, among other examples. In some aspects, the UE mayestimate a channel based at least in part on data symbols of thedownlink signals, and/or based at least in part on DMRSs within a datachannel and/or within a control channel to estimate a downlink channel.For example, the UE may estimate the channel (e.g., the uplink channel)based at least in part on an assumption of reciprocity with the downlinkchannel.

As shown by reference number 540, the UE may receive, and the basestation may transmit, an indication of one or more parameters that thebase station uses for estimating the TR subcarriers. In some aspects,the base station may transmit the indication of the one or moreparameters via within DCI, such as a DCI that schedules the one or moreuplink communications.

In some aspects, the one or more parameters may include that a mask isto be applied to the TR subcarriers to boost or de-boost a tonereservation signal on one or more of the TR subcarriers, that one ormore energy floors are configured for the TR subcarriers and/or one ormore values of the one or more energy floors configured for the TRsubcarriers. In this way, the base station may identify the TRsubcarriers with improved accuracy based at least in part on identifyingsubcarriers of the uplink communication that are near the one or moreenergy floors.

As shown by reference number 545, the UE may apply tone reservation toone or more TR subcarriers (e.g., based at least in part on receivedenergy on the one or more downlink signals) and/or may apply a mask tothe one or more TR subcarriers.

In some aspects, the UE may determine channel conditions (e.g., receivedenergy measurements, one or more SINR values, and/or one or more PAPRvalues, among other examples) based at least in part on the one or moredownlink signals and apply tone reservation based at least in part onthe channel conditions. In some aspects, the UE may apply tonereservation to the one or more TR subcarriers based at least in part onthe one or more TR subcarriers having a lowest received energy ofsubcarriers of the one or more downlink signals. In some aspects, the UEmay apply tone reservation based at least in part on receiving theindication of the measurement of one or more SINRs (e.g., themeasurement report described in connection with reference number 525)and/or based at least in part on transmission of one or more uplinkreference signals (e.g., the downlink signals described in connectionwith reference number 535).

In some aspects, the UE may apply tone reservation to a number ofsubcarriers, a fraction (e.g., percentage) of subcarriers, and/or basedat least in part on a threshold power for subcarriers, among otherexamples (e.g., as described herein). In some aspects, the UE may applytone reservation using a tone reservation optimization technique (e.g.,as described herein). In some aspects, the UE may apply tone reservationbased at least in part on a PAPR threshold and/or various tonereservation and/or optimization techniques to be iteratively used untilthe PAPR threshold is satisfied (e.g., as described herein).

In some aspects, the UE may apply tone reservation based at least inpart on an indication from the base station that indicates a number ofsubcarrier(s) (e.g., fraction or percentage) to which tone reservationis to be applied. In some aspects, the tone reservation frequencylocations (e.g., subcarrier identifiers) and corresponding values may beidentified to a mapper, along with data and/or pilots for transmissionto the base station (e.g., using OFDM transmission protocol (e.g.,IFFT)). The mapper may map the data and/or pilots to subcarriers of thechannel, excluding subcarriers to which tone reservation is applied.

In some aspects, the UE may apply the mask to the TR subcarriers tomodify energies of the TR subcarriers as observed by the base station.The mask may be configured to improve a PAPR of the uplinkcommunication. For example, the UE may apply the mask to boost a tonereservation signal on a first set of TR subcarriers (e.g., low-energy TRsubcarriers) and/or de-boost a tone reservation signal on a second setof TR subcarriers (e.g., high-energy TR subcarriers). In this way, themask may be configured to increase an average energy of the TRsubcarriers as observed by the base station (e.g., to improve a PAPR ofthe downlink communication) and/or may be configured to maintain and/orincrease an energy gap between the TR subcarriers and data subcarriersof the uplink communication as observed by the base station.

As shown by reference number 550, the UE may transmit, and the basestation may receive, the one or more uplink communications having thetone reservation applied to the one or more TR subcarriers. In someaspects, one or more TR subcarriers to which tone reservation is applied(e.g., by the UE) are based at least in part on the measurement of theone or more downlink signals on the one or more TR subcarriers (e.g., asdescribed herein).

As shown by reference number 555, the base station may determine achannel response and/or estimate the one or more TR subcarriers. In someaspects, estimating the TR subcarriers includes attempting to identifythe TR subcarriers based at least in part on a channel response of achannel that carries the one or more uplink communications.

In some aspects, the base station may determine a channel response ofthe one or more downlink communications to generate the set of estimatedindices. For example, the base station may generate the set of estimatedindices based at least in part on received energy on the one or more TRsubcarriers of the one or more uplink communications. In some aspects,the base station may generate the set of estimated indices based atleast in part on the indication that tone reservation is to be applied(e.g., described above in connection with reference number 530), amongother examples. In some aspects, the base station may determine thechannel response based at least in part on data symbols only, or on datasymbols and DMRS symbols, of the one or more uplink communications(e.g., based at least in part on an estimation of the lowest energysubcarriers using the data symbols and/or the DMRSs).

In some aspects, the base station may generate the set of estimatedindices to indicate one or more TR subcarriers having lowest receivedenergies of subcarriers used for the one or more uplink communications.In some aspects, the set of estimated indicates may include a number ofindices based at least in part on information included in the indicationthat tone reservation is to be applied to the one or more TR subcarriers(e.g., described above in connection with reference number 530).

As shown by reference number 560, the base station may decode the one ormore uplink communications. In some aspects, the base station may decodethe one or more uplink communications based at least in part on the tonereservation being applied to the one or more TR subcarriers. In someaspects, the base station may use information included in the indicationthat tone reservation is to be applied to the one or more TR subcarriers(e.g., described above in connection with reference number 530) todecode the one or more uplink communications. In some aspects, the basestation may decode the one or more uplink communications based at leastin part on discarding signals associated with the one or more TRsubcarriers to which tone reservation was applied (e.g., zeroing outLLRs of samples associated with the one or more TR subcarriers).

As indicated above, FIG. 5 is provided as an example. Other examples maydiffer from what is described with respect to FIG. 5 .

FIG. 6 is a diagram illustrating an example 600 of data aided channelbased tone reservation, in accordance with the present disclosure. Asshown in FIG. 6 , tone reservation may be applied to communicationstransmitted from a base station to a UE.

As shown in example 600, the base station may measure one or more UESRSs to estimate an uplink channel. The base station may use theestimate of the uplink channel to estimate a downlink channel (e.g.,using an assumption of reciprocity between the uplink channel and thedownlink channel). In some aspects, the base station may use theestimate of the downlink channel to determine subcarriers to which tonereservation is to be applied.

The base station may determine that tone reservation is to be applied toone or more subcarriers for downlink transmissions to the UE (e.g.,based at least in part on an SINR reported by the UE, the uplink channelestimate, other metrics associated with the uplink channel or thedownlink channel, network traffic, and/or an amount of data buffered fortransmission to the UE). When the base station determines that tonereservation is to be applied, the base station may then determine whichsubcarriers are to be selected for tone reservation. In some aspects,selection of subcarriers may be based at least in part on a defaultnumber, such as the lowest 10% of subcarriers. In some aspects,selection of the default number may be based at least in part on theSINR measurements.

As shown by reference number 610, in some aspects, the base station mayiteratively perform subcarrier selection techniques until a thresholdPAPR value is reached. For example, the base station may use the UEdownlink channel estimate, a default number of tones (e.g.,subcarriers), and a default PAPR threshold to perform a selectivemapping (SLM) technique, where alternative transmit sequence vectors(e.g., corresponding to the UE downlink channel) are generated from thesame data source by multiplying the vectors by a random or pseudo-randomphase. After multiplication, IFFT may be performed on the vectors toconvert the corresponding signal from the frequency domain to the timedomain, and PAPR values may be determined for each of the vectors. ThePAPR values may be compared to one another in a manner designed tooptimize tone reservation values by identifying a vector having tonereservations that result in a relatively low, or lowest, PAPR value withrespect to other vectors. The base station may then determine whetherthe PAPR threshold is satisfied by the tone reservations indicated inthe identified vector.

In some aspects, the subcarrier selection process may be performed up tok iterations, where k is a positive integer, and/or until a PAPR valuethat satisfies the threshold is reached. For example, if a default value(e.g., an initial value) for the number of subcarriers to which tonereservation is to be applied is 5%, and the subcarrier selection outputfails to satisfy the PAPR threshold by applying tone reservation to thelowest 5% of subcarriers, the base station may increase the defaultvalue (e.g., by a fixed amount, variable amount, or fixed rate) andperform SLM again to determine if reserving the increased number ofsubcarriers (e.g., the lowest 6%) will satisfy the PAPR threshold. Insome aspects, the PAPR threshold may be modified (e.g., lowered todecrease the number of subcarriers that would be reserved, or raised toincrease the number of subcarriers that would be reserved) wheniterating through the subcarrier selection process.

Once a tone reservation satisfying the PAPR threshold is identified, thebase station may use the identified tone reservation and modulated datato remap the modulated data using the identified tone reservation scheme(e.g., application of tone reservation on the identified subchannels).For example, in a situation where the subcarrier selection processindicates that the lowest 6% of subcarriers (e.g., in terms of SINR)should be reserved to meet a given PAPR threshold, the modulated datamay only be mapped to the top 94% subcarriers (e.g., based on receivedenergy and/or power), leaving the bottom 6% reserved. After applicationof IFFT, the resulting downlink communication may be transmitted to theUE.

The UE may receive the downlink communication as RF signals and may useanalog to digital conversion (ADC), using a configured number of bits,to provide digital output to a digital front end (DFE) of the UE. The UEmay then apply a fast Fourier transform (FFT) algorithm to convert thereceived signals to a frequency domain and obtain the UE downlinkcommunication.

The UE may decode a report of the tone reservation (e.g., included inDCI), which may indicate a number of subcarriers to which tonereservation was applied. For example, the report may indicate that tonereservation is to be applied to the lowest 6% of subcarriers.

The UE may use the downlink communication (e.g., data symbols) toestimate the energy (e.g., power) of the subcarriers of the channel(e.g., using SINR). After identifying the smallest (e.g., lowest) energysubcarriers (e.g., the bottom 6%), the UE may generate a set ofestimated indices associated with a hypothesis of the one or moresubcarriers. The UE may check the set of estimated indices with the setof verification bits. If the set of estimated indices does not match theset of verification bits, the UE may iteratively generate revised setsof estimated indices until a revised set of estimated indices matchesthe set of verification bits. The UE may discard the identifiedsubcarriers and decode the remaining the data.

As indicated above, FIG. 6 is provided as an example. Other examples maydiffer from what is described with respect to FIG. 6 .

FIG. 7 is a diagram illustrating an example 700 associated with dataaided channel oriented tone reservation, in accordance with the presentdisclosure. As shown in FIG. 7 , a base station (e.g., base station 110)may communicate with a UE (e.g., UE 120) using a communication channelthat is received with different channel powers at various subcarrierindices. In some aspects, the base station and the UE may be part of awireless network (e.g., wireless network 100).

Reference number 705 illustrates an estimated channel response to acommunication as observed by a receiving device. As shown, the estimatedchannel response indicates multiple subcarrier indices on which tonereservation may be applied to improve PAPR of the communication beforetransmitting the communication A transmitting device may determine toapply tone reservation on the indicated tone reservation locations(e.g., TR subcarriers) of the channel.

Reference number 710 illustrates an example of a channel response to acommunication having a mask applied, as observed by the receivingdevice. In some aspects, the transmitting device may apply the mask toboost low-energy subcarriers of the TR subcarriers and/or to de-boosthigh-energy subcarriers of the TR subcarriers to maintain and/orgenerate an energy gap between the TR subcarriers and data subcarriers(e.g., data locations of the channel) and/or to improve an averageenergy of the TR subcarriers. Improving the average energy of the TRsubcarriers may result in an improved PAPR for the communication byincreasing the lowest-energy subcarrier of the communication.

As indicated above, FIG. 7 is provided as an example. Other examples maydiffer from what is described with respect to FIG. 7 .

FIG. 8 is a diagram illustrating an example process 800 performed, forexample, by a base station, in accordance with the present disclosure.Example process 800 is an example where the base station (e.g., basestation 110) performs operations associated with data aided channeloriented tone reservation.

As shown in FIG. 8 , in some aspects, process 800 may includetransmitting an indication of parameters for estimating TR subcarriers,based at least in part on energies of data symbols of a communication,having tone reservation applied for the communication (block 810). Forexample, the base station (e.g., using communication manager 150 and/ortransmission component 1304, depicted in FIG. 13 ) may transmit anindication of parameters for estimating TR subcarriers, based at leastin part on energies of data symbols of a communication, having tonereservation applied for the communication, as described above.

As further shown in FIG. 8 , in some aspects, process 800 may includetransmitting the communication having the tone reservation applied tothe TR subcarriers (block 820). For example, the base station (e.g.,using communication manager 150 and/or transmission component 1304,depicted in FIG. 13 ) may transmit the communication having the tonereservation applied to the TR subcarriers, as described above.

Process 800 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, the parameters indicate one or more of that a mask isto be applied to the TR subcarriers to boost or de-boost a tonereservation signal on one or more of the TR subcarriers, that one ormore energy floors are configured for the TR subcarriers, or one or morevalues of the one or more energy floors configured for the TRsubcarriers.

In a second aspect, alone or in combination with the first aspect, theparameters indicate the one or more values of the one or more energyfloors based at least in part on one or more of one or more energyvalues, or one or more energies relative to an energy of a datasubcarrier.

In a third aspect, alone or in combination with one or more of the firstand second aspects, process 800 includes applying a mask to the TRsubcarriers, wherein the mask indicates to provide a power boost to oneor more of the TR subcarriers.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the mask is configured to improve apeak-to-average-power-ratio of the communication.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the mask is configured to maintain an energy gapbetween the TR subcarriers and data subcarriers of the communication, asobserved by a user equipment.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, process 800 includes applying tone reservation tothe TR subcarriers of the communication based at least in part on one ormore of measurements of one or more uplink signals received from a userequipment, or a measurement report indicating a channel response of adownlink channel.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the tone reservation is applied to the TRsubcarriers based at least in part on the TR subcarriers having anestimated lowest received energy of subcarriers of the communication onthe data symbols of the communication.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, process 800 includes transmitting one ormore of an indication that tone reservation is applied to the TRsubcarriers of the communication, or an indication to use data symbolsof the communication to estimate locations of the TR subcarriers.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, the parameters indicate one or more of a numberof subcarriers to which tone reservation is to be applied, a fraction ofsubcarriers to which tone reservation is to be applied, or a thresholdenergy for subcarriers to which tone reservation is to be applied.

Although FIG. 8 shows example blocks of process 800, in some aspects,process 800 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 8 .Additionally, or alternatively, two or more of the blocks of process 800may be performed in parallel.

FIG. 9 is a diagram illustrating an example process 900 performed, forexample, by a base station, in accordance with the present disclosure.Example process 900 is an example where the base station (e.g., basestation 110) performs operations associated with data aided channeloriented tone reservation.

As shown in FIG. 9 , in some aspects, process 900 may includetransmitting an indication of parameters that the base station uses forestimating TR subcarriers, based at least in part on energies of datasymbols of a communication, having tone reservation applied for thecommunication (block 910). For example, the base station (e.g., usingcommunication manager 150 and/or transmission component 1304, depictedin FIG. 13 ) may transmit an indication of parameters that the basestation uses for estimating TR subcarriers, based at least in part onenergies of data symbols of a communication, having tone reservationapplied for the communication, as described above.

As further shown in FIG. 9 , in some aspects, process 900 may includereceiving the communication having the tone reservation applied to theTR subcarriers (block 920). For example, the base station (e.g., usingcommunication manager 150 and/or reception component 1302, depicted inFIG. 13 ) may receive the communication having the tone reservationapplied to the TR subcarriers, as described above.

Process 900 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, the parameters indicate one or more of that a mask isto be applied to the TR subcarriers to boost or de-boost a tonereservation signal on one or more of the TR subcarriers, that one ormore energy floors are configured for the TR subcarriers, or one or morevalues of the one or more energy floors configured for the TRsubcarriers.

In a second aspect, alone or in combination with the first aspect, theparameters indicate the one or more values of the one or more energyfloors based at least in part on one or more of one or more energyvalues, or one or more energies relative to an energy of a datasubcarrier.

In a third aspect, alone or in combination with one or more of the firstand second aspects, process 900 includes transmitting an indication of amask to apply to the TR subcarriers, wherein the mask indicates toprovide a power boost to one or more of the TR subcarriers.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the mask is configured to improve apeak-to-average-power-ratio of the communication.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the mask is configured to maintain an energy gapbetween the TR subcarriers and data subcarriers of the communication, asobserved by the base station.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, process 900 includes transmitting an indicationto apply the tone reservation to the TR subcarriers of the communicationbased at least in part on one or more of measurements of one or moredownlink signals received from the base station, or a measurementreport, received from the base station, indicating a channel response ofan uplink channel.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the indication to apply the tonereservation to the TR subcarriers of the communication indicates toapply the tone reservation to the TR subcarriers based at least in parton the TR subcarriers having an estimated lowest received energy, asobserved by the base station, of subcarriers of the communication on thedata symbols of the communication.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, process 900 includes transmitting one ormore of an indication to apply tone reservation to the TR subcarriers ofthe communication, or an indication that the base station is to use datasymbols of the communication to estimate locations of the TRsubcarriers.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, the parameters indicate one or more of a numberof subcarriers to which tone reservation is to be applied, a fraction ofsubcarriers to which tone reservation is to be applied, or a thresholdenergy for subcarriers to which tone reservation is to be applied.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, process 900 includes determining a channelresponse of the communication, including received energy on subcarriersof the communication, estimating the TR subcarriers having tonereservation applied based at least in part on received energy on the TRsubcarriers, and discarding, rate matching, or zeroing out signalsreceived on the TR subcarriers.

Although FIG. 9 shows example blocks of process 900, in some aspects,process 900 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 9 .Additionally, or alternatively, two or more of the blocks of process 900may be performed in parallel.

FIG. 10 is a diagram illustrating an example process 1000 performed, forexample, by a UE, in accordance with the present disclosure. Exampleprocess 1000 is an example where the UE (e.g., UE 120) performsoperations associated with data aided channel oriented tone reservation.

As shown in FIG. 10 , in some aspects, process 1000 may includereceiving an indication of parameters for estimating TR subcarriers,based at least in part on energies of data symbols of a communication,having tone reservation applied for the communication (block 1010). Forexample, the UE (e.g., using communication manager 140 and/or receptioncomponent 1202, depicted in FIG. 12 ) may receive an indication ofparameters for estimating TR subcarriers, based at least in part onenergies of data symbols of a communication, having tone reservationapplied for the communication, as described above.

As further shown in FIG. 10 , in some aspects, process 1000 may includereceiving the communication having the tone reservation applied to theTR subcarriers (block 1020). For example, the UE (e.g., usingcommunication manager 140 and/or reception component 1202, depicted inFIG. 12 ) may receive the communication having the tone reservationapplied to the TR subcarriers, as described above.

Process 1000 may include additional aspects, such as any single aspector any combination of aspects described below and/or in connection withone or more other processes described elsewhere herein.

In a first aspect, the parameters indicate one or more of that a mask isto be applied to the TR subcarriers to boost or de-boost a tonereservation signal on one or more of the TR subcarriers, that one ormore energy floors are configured for the TR subcarriers, or one or morevalues of the one or more energy floors configured for the TRsubcarriers.

In a second aspect, alone or in combination with the first aspect, theparameters indicate the one or more values of the one or more energyfloors based at least in part on one or more of one or more energyvalues, or one or more energies relative to an energy of a datasubcarrier.

In a third aspect, alone or in combination with one or more of the firstand second aspects, process 1000 includes transmitting one or more ofuplinking signals for measurement by a base station to determine the TRsubcarriers for applying the tone reservation, or a measurement reportindicating a channel response of a downlink channel.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, process 1000 includes determining a channelresponse of the communication, including received energy on subcarriersof the communication, estimating the TR subcarriers having tonereservation applied based at least in part on received energy on the TRsubcarriers, and discarding, rate matching, or zeroing out signalsreceived on the TR subcarriers.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, process 1000 includes determining the channelresponse based at least in part on data symbols and demodulationreference signals of the communication, or determining the channelresponse based at least in part on data symbols and not on demodulationreference signals of the communication.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, process 1000 includes estimating the TRsubcarriers having tone reservation applied based at least in part onthe TR subcarriers having a lowest received energy of subcarriers of thecommunication.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, process 1000 includes receiving one or moreof an indication that tone reservation is applied to the TR subcarriersof the communication, or an indication to use data symbols of thecommunication to estimate locations of the TR subcarriers.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, the parameters indicate one or more of anumber of subcarriers to which tone reservation is to be applied, afraction of subcarriers to which tone reservation is to be applied, or athreshold energy for subcarriers to which tone reservation is to beapplied.

Although FIG. 10 shows example blocks of process 1000, in some aspects,process 1000 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 10 .Additionally, or alternatively, two or more of the blocks of process1000 may be performed in parallel.

FIG. 11 is a diagram illustrating an example process 1100 performed, forexample, by a UE, in accordance with the present disclosure. Exampleprocess 1100 is an example where the UE (e.g., UE 120) performsoperations associated with data aided channel oriented tone reservation.

As shown in FIG. 11 , in some aspects, process 1100 may includereceiving an indication of parameters that a base station uses forestimating TR subcarriers, based at least in part on energies of datasymbols of a communication, having tone reservation applied for thecommunication (block 1110). For example, the UE (e.g., usingcommunication manager 140 and/or reception component 1202, depicted inFIG. 12 ) may receive an indication of parameters that a base stationuses for estimating TR subcarriers, based at least in part on energiesof data symbols of a communication, having tone reservation applied forthe communication, as described above.

As further shown in FIG. 11 , in some aspects, process 1100 may includetransmitting the communication having the tone reservation applied tothe TR subcarriers (block 1120). For example, the UE (e.g., usingcommunication manager 140 and/or transmission component 1204, depictedin FIG. 12 ) may transmit the communication having the tone reservationapplied to the TR subcarriers, as described above.

Process 1100 may include additional aspects, such as any single aspector any combination of aspects described below and/or in connection withone or more other processes described elsewhere herein.

In a first aspect, the parameters indicate one or more of that a mask isto be applied to the TR subcarriers to boost or de-boost a tonereservation signal on one or more of the TR subcarriers, that one ormore energy floors are to be configured for the TR subcarriers, or oneor more values of the one or more energy floors configured for the TRsubcarriers.

In a second aspect, alone or in combination with the first aspect, theparameters indicate the one or more values of the one or more energyfloors based at least in part on one or more of one or more energyvalues, or one or more energies relative to an energy of a datasubcarrier.

In a third aspect, alone or in combination with one or more of the firstand second aspects, process 1100 includes receiving an indication of amask to apply to the TR subcarriers, wherein the mask indicates toprovide a power boost to one or more of the TR subcarriers.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the mask is configured to improve apeak-to-average-power-ratio of the communication.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the mask is configured to maintain an energy gapbetween the TR subcarriers and data subcarriers of the communication, asobserved by the base station.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, process 1100 includes receiving an indication toapply the tone reservation to the TR subcarriers of the communicationbased at least in part on one or more of measurements of one or moredownlink signals received from the base station, or a measurementreport, received from the base station, indicating a channel response ofan uplink channel.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the indication to apply the tonereservation to the TR subcarriers of the communication indicates toapply the tone reservation to the TR subcarriers based at least in parton the TR subcarriers having an estimated lowest received energy, asobserved by the base station, of subcarriers of the communication on thedata symbols of the communication.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, process 1100 includes transmitting one ormore of an indication to apply tone reservation to the TR subcarriers ofthe communication, or an indication that the base station is to use datasymbols of the communication to estimate locations of the TRsubcarriers.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, the parameters indicate one or more of a numberof subcarriers to which tone reservation is to be applied, a fraction ofsubcarriers to which tone reservation is to be applied, or a thresholdenergy for subcarriers to which tone reservation is to be applied.

Although FIG. 11 shows example blocks of process 1100, in some aspects,process 1100 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 11 .Additionally, or alternatively, two or more of the blocks of process1100 may be performed in parallel.

FIG. 12 is a block diagram of an example apparatus 1200 for wirelesscommunication. The apparatus 1200 may be a UE, or a UE may include theapparatus 1200. In some aspects, the apparatus 1200 includes a receptioncomponent 1202 and a transmission component 1204, which may be incommunication with one another (for example, via one or more busesand/or one or more other components). As shown, the apparatus 1200 maycommunicate with another apparatus 1206 (such as a UE, a base station,or another wireless communication device) using the reception component1202 and the transmission component 1204. As further shown, theapparatus 1200 may include a communication manager 1208 (e.g., thecommunication manager 140). The communication manager 1208 may include adetermination component and/or an estimating component, among otherexamples.

In some aspects, the apparatus 1200 may be configured to perform one ormore operations described herein in connection with FIGS. 4-7 .Additionally, or alternatively, the apparatus 1200 may be configured toperform one or more processes described herein, such as process 1000 ofFIG. 10 , process 1100 of FIG. 11 , or a combination thereof. In someaspects, the apparatus 1200 and/or one or more components shown in FIG.12 may include one or more components of the UE described above inconnection with FIG. 2 . Additionally, or alternatively, one or morecomponents shown in FIG. 12 may be implemented within one or morecomponents described above in connection with FIG. 2 . Additionally, oralternatively, one or more components of the set of components may beimplemented at least in part as software stored in a memory. Forexample, a component (or a portion of a component) may be implemented asinstructions or code stored in a non-transitory computer-readable mediumand executable by a controller or a processor to perform the functionsor operations of the component.

The reception component 1202 may receive communications, such asreference signals, control information, data communications, or acombination thereof, from the apparatus 1206. The reception component1202 may provide received communications to one or more other componentsof the apparatus 1200. In some aspects, the reception component 1202 mayperform signal processing on the received communications (such asfiltering, amplification, demodulation, analog-to-digital conversion,demultiplexing, deinterleaving, de-mapping, equalization, interferencecancellation, or decoding, among other examples), and may provide theprocessed signals to the one or more other components of the apparatus1206. In some aspects, the reception component 1202 may include one ormore antennas, a demodulator, a MIMO detector, a receive processor, acontroller/processor, a memory, or a combination thereof, of the UEdescribed above in connection with FIG. 2 .

The transmission component 1204 may transmit communications, such asreference signals, control information, data communications, or acombination thereof, to the apparatus 1206. In some aspects, one or moreother components of the apparatus 1206 may generate communications andmay provide the generated communications to the transmission component1204 for transmission to the apparatus 1206. In some aspects, thetransmission component 1204 may perform signal processing on thegenerated communications (such as filtering, amplification, modulation,digital-to-analog conversion, multiplexing, interleaving, mapping, orencoding, among other examples), and may transmit the processed signalsto the apparatus 1206. In some aspects, the transmission component 1204may include one or more antennas, a modulator, a transmit MIMOprocessor, a transmit processor, a controller/processor, a memory, or acombination thereof, of the UE described above in connection with FIG. 2. In some aspects, the transmission component 1204 may be co-locatedwith the reception component 1202 in a transceiver.

The reception component 1202 may receive an indication of parameters forestimating TR subcarriers, based at least in part on energies of datasymbols of a communication, having tone reservation applied for thecommunication. The reception component 1202 may receive thecommunication having the tone reservation applied to the TR subcarriers.

The transmission component 1204 may transmit one or more of uplinksignals for measurement by a base station to determine the TRsubcarriers for applying the tone reservation, or a measurement reportindicating a channel response of a downlink channel.

The communication manager 1208 may determine a channel response of thecommunication, including received energy on subcarriers of thecommunication.

The communication manager 1208 may estimate the TR subcarriers havingtone reservation applied based at least in part on received energy onthe TR subcarriers.

The communication manager 1208 may discard, rate matching, or zeroingout signals received on the TR subcarriers.

The communication manager 1208 may determine the channel response basedat least in part on data symbols and demodulation reference signals ofthe communication.

The communication manager 1208 may determine the channel response basedat least in part on data symbols and not on demodulation referencesignals of the communication.

The communication manager 1208 may estimate the TR subcarriers havingtone reservation applied based at least in part on the TR subcarriershaving a lowest received energy of subcarriers of the communication.

The reception component 1202 may receive one or more of an indicationthat tone reservation is applied to the TR subcarriers of thecommunication; or an indication to use data symbols of the communicationto estimate locations of the TR subcarriers.

The reception component 1202 may receive an indication of parametersthat a base station uses for estimating TR subcarriers, based at leastin part on energies of data symbols of a communication, having tonereservation applied for the communication. The transmission component1204 may transmit the communication having the tone reservation appliedto the TR subcarriers.

The reception component 1202 may receive an indication of a mask toapply to the TR subcarriers wherein the mask indicates to provide apower boost to one or more of the TR subcarriers.

The reception component 1202 may receive an indication to apply the tonereservation to the TR subcarriers of the communication based at least inpart on one or more of measurements of one or more downlink signalsreceived from the base station, or a measurement report, received fromthe base station, indicating a channel response of an uplink channel.

The transmission component 1204 may transmit one or more of anindication to apply tone reservation to the TR subcarriers of thecommunication; or an indication that the base station is to use datasymbols of the communication to estimate locations of the TRsubcarriers.

The number and arrangement of components shown in FIG. 12 are providedas an example. In practice, there may be additional components, fewercomponents, different components, or differently arranged componentsthan those shown in FIG. 12 . Furthermore, two or more components shownin FIG. 12 may be implemented within a single component, or a singlecomponent shown in FIG. 12 may be implemented as multiple, distributedcomponents. Additionally, or alternatively, a set of (one or more)components shown in FIG. 12 may perform one or more functions describedas being performed by another set of components shown in FIG. 12 .

FIG. 13 is a block diagram of an example apparatus 1300 for wirelesscommunication. The apparatus 1300 may be a base station, or a basestation may include the apparatus 1300. In some aspects, the apparatus1300 includes a reception component 1302 and a transmission component1304, which may be in communication with one another (for example, viaone or more buses and/or one or more other components). As shown, theapparatus 1300 may communicate with another apparatus 1306 (such as aUE, a base station, or another wireless communication device) using thereception component 1302 and the transmission component 1304. As furthershown, the apparatus 1300 may include a communication manager 1308 (thecommunication manager 150). The communication manager 1308 may includeone or more of a determination component and/or an estimation component,among other examples.

In some aspects, the apparatus 1300 may be configured to perform one ormore operations described herein in connection with FIGS. 4-7 .Additionally, or alternatively, the apparatus 1300 may be configured toperform one or more processes described herein, such as process 800 ofFIG. 8 , process 900 of FIG. 9 , or a combination thereof. In someaspects, the apparatus 1300 and/or one or more components shown in FIG.13 may include one or more components of the base station describedabove in connection with FIG. 2 . Additionally, or alternatively, one ormore components shown in FIG. 13 may be implemented within one or morecomponents described above in connection with FIG. 2 . Additionally, oralternatively, one or more components of the set of components may beimplemented at least in part as software stored in a memory. Forexample, a component (or a portion of a component) may be implemented asinstructions or code stored in a non-transitory computer-readable mediumand executable by a controller or a processor to perform the functionsor operations of the component.

The reception component 1302 may receive communications, such asreference signals, control information, data communications, or acombination thereof, from the apparatus 1306. The reception component1302 may provide received communications to one or more other componentsof the apparatus 1300. In some aspects, the reception component 1302 mayperform signal processing on the received communications (such asfiltering, amplification, demodulation, analog-to-digital conversion,demultiplexing, deinterleaving, de-mapping, equalization, interferencecancellation, or decoding, among other examples), and may provide theprocessed signals to the one or more other components of the apparatus1306. In some aspects, the reception component 1302 may include one ormore antennas, a demodulator, a MIMO detector, a receive processor, acontroller/processor, a memory, or a combination thereof, of the basestation described above in connection with FIG. 2 .

The transmission component 1304 may transmit communications, such asreference signals, control information, data communications, or acombination thereof, to the apparatus 1306. In some aspects, one or moreother components of the apparatus 1306 may generate communications andmay provide the generated communications to the transmission component1304 for transmission to the apparatus 1306. In some aspects, thetransmission component 1304 may perform signal processing on thegenerated communications (such as filtering, amplification, modulation,digital-to-analog conversion, multiplexing, interleaving, mapping, orencoding, among other examples), and may transmit the processed signalsto the apparatus 1306. In some aspects, the transmission component 1304may include one or more antennas, a modulator, a transmit MIMOprocessor, a transmit processor, a controller/processor, a memory, or acombination thereof, of the base station described above in connectionwith FIG. 2 . In some aspects, the transmission component 1304 may beco-located with the reception component 1302 in a transceiver.

The transmission component 1304 may transmit an indication of parametersfor estimating TR subcarriers, based at least in part on energies ofdata symbols of a communication, having tone reservation applied for thecommunication. The transmission component 1304 may transmit thecommunication having the tone reservation applied to the TR subcarriers.

The communication manager 1308 may apply a mask to the TR subcarrierswherein the mask indicates to provide a power boost to one or more ofthe TR subcarriers.

The communication manager 1308 may apply tone reservation to the TRsubcarriers of the communication based at least in part on one or moreof measurements of one or more uplink signals received from a userequipment, or a measurement report indicating a channel response of adownlink channel.

The transmission component 1304 may transmit one or more of anindication that tone reservation is applied to the TR subcarriers of thecommunication; or an indication to use data symbols of the communicationto estimate locations of the TR subcarriers.

The transmission component 1304 may transmit an indication of parametersthat the base station uses for estimating TR subcarriers, based at leastin part on energies of data symbols of a communication, having tonereservation applied for the communication. The reception component 1302may receive the communication having the tone reservation applied to theTR subcarriers.

The transmission component 1304 may transmit an indication of a mask toapply to the TR subcarriers wherein the mask indicates to provide apower boost to one or more of the TR subcarriers.

The transmission component 1304 may transmit an indication to apply thetone reservation to the TR subcarriers of the communication based atleast in part on one or more of measurements of one or more downlinksignals received from the base station, or a measurement report,received from the base station, indicating a channel response of anuplink channel.

The transmission component 1304 may transmit one or more of anindication to apply tone reservation to the TR subcarriers of thecommunication; or an indication that the base station is to use datasymbols of the communication to estimate locations of the TRsubcarriers.

The communication manager 1308 may determine a channel response of thecommunication, including received energy on subcarriers of thecommunication.

The communication manager 1308 may estimate the TR subcarriers havingtone reservation applied based at least in part on received energy onthe TR subcarriers.

The communication manager 1308 may discard, rate matching, or zeroingout signals received on the TR subcarriers.

The number and arrangement of components shown in FIG. 13 are providedas an example. In practice, there may be additional components, fewercomponents, different components, or differently arranged componentsthan those shown in FIG. 13 . Furthermore, two or more components shownin FIG. 13 may be implemented within a single component, or a singlecomponent shown in FIG. 13 may be implemented as multiple, distributedcomponents. Additionally, or alternatively, a set of (one or more)components shown in FIG. 13 may perform one or more functions describedas being performed by another set of components shown in FIG. 13 .

The following provides an overview of some Aspects of the presentdisclosure:

Aspect 1: A method of wireless communication performed by a basestation, comprising: transmitting an indication of parameters forestimating tone reservation (TR) subcarriers, based at least in part onenergies of data symbols of a communication, having tone reservationapplied for the communication; and transmitting the communication havingthe tone reservation applied to the TR subcarriers.

Aspect 2: The method of Aspect 1, wherein the parameters indicate one ormore of: that a mask is to be applied to the TR subcarriers to boost orde-boost a tone reservation signal on one or more of the TR subcarriers,that one or more energy floors are configured for the TR subcarriers, orone or more values of the one or more energy floors configured for theTR subcarriers.

Aspect 3: The method of Aspect 2, wherein the parameters indicate theone or more values of the one or more energy floors based at least inpart on one or more of: one or more energy values, or one or moreenergies relative to an energy of a data subcarrier.

Aspect 4: The method of any of Aspects 1-3, further comprising applyinga mask to the TR subcarriers, wherein the mask indicates to provide apower boost to one or more of the TR subcarriers.

Aspect 5: The method of Aspect 4, wherein the mask is configured toimprove a peak-to-average-power-ratio of the communication.

Aspect 6: The method of any of Aspects 4-5, wherein the mask isconfigured to maintain an energy gap between the TR subcarriers and datasubcarriers of the communication, as observed by a user equipment.

Aspect 7: The method of any of Aspects 1-6, further comprising: applyingtone reservation to the TR subcarriers of the communication based atleast in part on one or more of: measurements of one or more uplinksignals received from a user equipment, or a measurement reportindicating a channel response of a downlink channel.

Aspect 8: The method of Aspect 7, wherein the tone reservation isapplied to the TR subcarriers based at least in part on the TRsubcarriers having an estimated lowest received energy of subcarriers ofthe communication on the data symbols of the communication.

Aspect 9: The method of any of Aspects 1-8, further comprisingtransmitting one or more of: an indication that tone reservation isapplied to the TR subcarriers of the communication; or an indication touse data symbols of the communication to estimate locations of the TRsubcarriers.

Aspect 10: The method of any of Aspects 1-9, wherein the parametersindicate one or more of: a number of subcarriers to which tonereservation is to be applied, a fraction of subcarriers to which tonereservation is to be applied, or a threshold energy for subcarriers towhich tone reservation is to be applied.

Aspect 11: A method of wireless communication performed by a basestation, comprising: transmitting an indication of parameters that thebase station uses for estimating tone reservation (TR) subcarriers,based at least in part on energies of data symbols of a communication,having tone reservation applied for the communication; and receiving thecommunication having the tone reservation applied to the TR subcarriers.

Aspect 12: The method of Aspect 11, wherein the parameters indicate oneor more of: that a mask is to be applied to the TR subcarriers to boostor de-boost a tone reservation signal on one or more of the TRsubcarriers, that one or more energy floors are configured for the TRsubcarriers, or one or more values of the one or more energy floorsconfigured for the TR subcarriers.

Aspect 13: The method of Aspect 12, wherein the parameters indicate theone or more values of the one or more energy floors based at least inpart on one or more of: one or more energy values, or one or moreenergies relative to an energy of a data subcarrier.

Aspect 14: The method of any of Aspects 11-13, further comprisingtransmitting an indication of a mask to apply to the TR subcarriers,wherein the mask indicates to provide a power boost to one or more ofthe TR subcarriers.

Aspect 15: The method of Aspect 14, wherein the mask is configured toimprove a peak-to-average-power-ratio of the communication.

Aspect 16: The method of any of Aspects 14-15, wherein the mask isconfigured to maintain an energy gap between the TR subcarriers and datasubcarriers of the communication, as observed by the base station.

Aspect 17: The method of any of Aspects 11-16, further comprising:transmitting an indication to apply the tone reservation to the TRsubcarriers of the communication based at least in part on one or moreof: measurements of one or more downlink signals received from the basestation, or a measurement report, received from the base station,indicating a channel response of an uplink channel.

Aspect 18: The method of Aspect 17, wherein the indication to apply thetone reservation to the TR subcarriers of the communication indicates toapply the tone reservation to the TR subcarriers based at least in parton the TR subcarriers having an estimated lowest received energy, asobserved by the base station, of subcarriers of the communication on thedata symbols of the communication.

Aspect 19: The method of any of Aspects 11-18, further comprisingtransmitting one or more of: an indication to apply tone reservation tothe TR subcarriers of the communication; or an indication that the basestation is to use data symbols of the communication to estimatelocations of the TR subcarriers.

Aspect 20: The method of any of Aspects 11-19, wherein the parametersindicate one or more of: a number of subcarriers to which tonereservation is to be applied, a fraction of subcarriers to which tonereservation is to be applied, or a threshold energy for subcarriers towhich tone reservation is to be applied.

Aspect 21: The method of any of Aspects 11-20, further comprising:determining a channel response of the communication, including receivedenergy on subcarriers of the communication; estimating the TRsubcarriers having tone reservation applied based at least in part onreceived energy on the TR subcarriers; and discarding, rate matching, orzeroing out signals received on the TR subcarriers.

Aspect 22: A method of wireless communication performed by a userequipment (UE), comprising: receiving an indication of parameters forestimating tone reservation (TR) subcarriers, based at least in part onenergies of data symbols of a communication, having tone reservationapplied for the communication; and receiving the communication havingthe tone reservation applied to the TR subcarriers.

Aspect 23: The method of Aspect 22, wherein the parameters indicate oneor more of: that a mask is to be applied to the TR subcarriers to boostor de-boost a tone reservation signal on one or more of the TRsubcarriers, that one or more energy floors are configured for the TRsubcarriers, or one or more values of the one or more energy floorsconfigured for the TR subcarriers.

Aspect 24: The method of Aspect 23, wherein the parameters indicate theone or more values of the one or more energy floors based at least inpart on one or more of: one or more energy values, or one or moreenergies relative to an energy of a data subcarrier.

Aspect 25: The method of any of Aspects 22-24, further comprisingtransmitting one or more of: uplink signals for measurement by a basestation to determine the TR subcarriers for applying the tonereservation, or a measurement report indicating a channel response of adownlink channel.

Aspect 26: The method of any of Aspects 22-25, further comprising:determining a channel response of the communication, including receivedenergy on subcarriers of the communication; estimating the TRsubcarriers having tone reservation applied based at least in part onreceived energy on the TR subcarriers; and discarding, rate matching, orzeroing out signals received on the TR subcarriers.

Aspect 27: The method of Aspect 26, further comprising: determining thechannel response based at least in part on data symbols and demodulationreference signals of the communication; or determining the channelresponse based at least in part on data symbols and not on demodulationreference signals of the communication.

Aspect 28: The method of any of Aspects 26-27, further comprising:estimating the TR subcarriers having tone reservation applied based atleast in part on the TR subcarriers having a lowest received energy ofsubcarriers of the communication.

Aspect 29: The method of any of Aspects 22-28, further comprisingreceiving one or more of: an indication that tone reservation is appliedto the TR subcarriers of the communication; or an indication to use datasymbols of the communication to estimate locations of the TRsubcarriers.

Aspect 30: The method of any of Aspects 22-29, wherein the parametersindicate one or more of: a number of subcarriers to which tonereservation is to be applied, a fraction of subcarriers to which tonereservation is to be applied, or a threshold energy for subcarriers towhich tone reservation is to be applied.

Aspect 31: A method of wireless communication performed by a userequipment (UE), comprising: receiving an indication of parameters that abase station uses for estimating tone reservation (TR) subcarriers,based at least in part on energies of data symbols of a communication,having tone reservation applied for the communication; and transmittingthe communication having the tone reservation applied to the TRsubcarriers.

Aspect 32: The method of Aspect 31, wherein the parameters indicate oneor more of: that a mask is to be applied to the TR subcarriers to boostor de-boost a tone reservation signal on one or more of the TRsubcarriers, that one or more energy floors are to be configured for theTR subcarriers, or one or more values of the one or more energy floorsconfigured for the TR subcarriers.

Aspect 33: The method of Aspect 32, wherein the parameters indicate theone or more values of the one or more energy floors based at least inpart on one or more of: one or more energy values, or one or moreenergies relative to an energy of a data subcarrier.

Aspect 34: The method of any of Aspects 32-33, further comprisingreceiving an indication of a mask to apply to the TR subcarriers,wherein the mask indicates to provide a power boost to one or more ofthe TR subcarriers.

Aspect 35: The method of Aspect 34, wherein the mask is configured toimprove a peak-to-average-power-ratio of the communication.

Aspect 36: The method of any of Aspects 34-35, wherein the mask isconfigured to maintain an energy gap between the TR subcarriers and datasubcarriers of the communication, as observed by the base station.

Aspect 37: The method of any of Aspects 32-36, further comprising:receiving an indication to apply the tone reservation to the TRsubcarriers of the communication based at least in part on one or moreof: measurements of one or more downlink signals received from the basestation, or a measurement report, received from the base station,indicating a channel response of an uplink channel.

Aspect 38: The method of Aspect 37, wherein the indication to apply thetone reservation to the TR subcarriers of the communication indicates toapply the tone reservation to the TR subcarriers based at least in parton the TR subcarriers having an estimated lowest received energy, asobserved by the base station, of subcarriers of the communication on thedata symbols of the communication.

Aspect 39: The method of any of Aspects 32-38, further comprisingtransmitting one or more of: an indication to apply tone reservation tothe TR subcarriers of the communication; or an indication that the basestation is to use data symbols of the communication to estimatelocations of the TR subcarriers.

Aspect 40: The method of any of Aspects 32-39, wherein the parametersindicate one or more of: a number of subcarriers to which tonereservation is to be applied, a fraction of subcarriers to which tonereservation is to be applied, or a threshold energy for subcarriers towhich tone reservation is to be applied.

Aspect 41: An apparatus for wireless communication at a device,comprising a processor; memory coupled with the processor; andinstructions stored in the memory and executable by the processor tocause the apparatus to perform the method of one or more of Aspects1-40.

Aspect 42: A device for wireless communication, comprising a memory andone or more processors coupled to the memory, the one or more processorsconfigured to perform the method of one or more of Aspects 1-40.

Aspect 43: An apparatus for wireless communication, comprising at leastone means for performing the method of one or more of Aspects 1-40.

Aspect 44: A non-transitory computer-readable medium storing code forwireless communication, the code comprising instructions executable by aprocessor to perform the method of one or more of Aspects 1-40.

Aspect 45: A non-transitory computer-readable medium storing a set ofinstructions for wireless communication, the set of instructionscomprising one or more instructions that, when executed by one or moreprocessors of a device, cause the device to perform the method of one ormore of Aspects 1-40.

The foregoing disclosure provides illustration and description, but isnot intended to be exhaustive or to limit the aspects to the preciseforms disclosed. Modifications and variations may be made in light ofthe above disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construedas hardware and/or a combination of hardware and software. “Software”shall be construed broadly to mean instructions, instruction sets, code,code segments, program code, programs, subprograms, software modules,applications, software applications, software packages, routines,subroutines, objects, executables, threads of execution, procedures,and/or functions, among other examples, whether referred to as software,firmware, middleware, microcode, hardware description language, orotherwise. As used herein, a processor is implemented in hardware and/ora combination of hardware and software. It will be apparent that systemsand/or methods described herein may be implemented in different forms ofhardware and/or a combination of hardware and software. The actualspecialized control hardware or software code used to implement thesesystems and/or methods is not limiting of the aspects. Thus, theoperation and behavior of the systems and/or methods were describedherein without reference to specific software code—it being understoodthat software and hardware can be designed to implement the systemsand/or methods based, at least in part, on the description herein.

As used herein, satisfying a threshold may, depending on the context,refer to a value being greater than the threshold, greater than or equalto the threshold, less than the threshold, less than or equal to thethreshold, equal to the threshold, not equal to the threshold, or thelike.

Even though particular combinations of features are recited in theclaims and/or disclosed in the specification, these combinations are notintended to limit the disclosure of various aspects. In fact, many ofthese features may be combined in ways not specifically recited in theclaims and/or disclosed in the specification. Although each dependentclaim listed below may directly depend on only one claim, the disclosureof various aspects includes each dependent claim in combination withevery other claim in the claim set. As used herein, a phrase referringto “at least one of” a list of items refers to any combination of thoseitems, including single members. As an example, “at least one of: a, b,or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well asany combination with multiples of the same element (e.g., a-a, a-a-a,a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or anyother ordering of a, b, and c).

No element, act, or instruction used herein should be construed ascritical or essential unless explicitly described as such. Also, as usedherein, the articles “a” and “an” are intended to include one or moreitems and may be used interchangeably with “one or more.” Further, asused herein, the article “the” is intended to include one or more itemsreferenced in connection with the article “the” and may be usedinterchangeably with “the one or more.” Furthermore, as used herein, theterms “set” and “group” are intended to include one or more items (e.g.,related items, unrelated items, or a combination of related andunrelated items), and may be used interchangeably with “one or more.”Where only one item is intended, the phrase “only one” or similarlanguage is used. Also, as used herein, the terms “has,” “have,”“having,” or the like are intended to be open-ended terms. Further, thephrase “based on” is intended to mean “based, at least in part, on”unless explicitly stated otherwise. Also, as used herein, the term “or”is intended to be inclusive when used in a series and may be usedinterchangeably with “and/or,” unless explicitly stated otherwise (e.g.,if used in combination with “either” or “only one of”).

What is claimed is:
 1. A user equipment (UE) for wireless communication,comprising: a memory; and one or more processors, coupled to the memory,configured to: receive an indication of parameters for estimatinglocations of tone reservation (TR) subcarriers, wherein the estimatinglocations of TR subcarriers is based at least in part on energies ofdata symbols of a communication, having tone reservation applied for thecommunication; and receive the communication having the tone reservationapplied to the TR subcarriers.
 2. The UE of claim 1, wherein theparameters indicate one or more of: that a mask is to be applied to theTR subcarriers to boost or de-boost a tone reservation signal on one ormore of the TR subcarriers, that one or more energy floors areconfigured for the TR subcarriers, or one or more values of the one ormore energy floors configured for the TR subcarriers.
 3. The UE of claim2, wherein the parameters indicate the one or more values of the one ormore energy floors based at least in part on one or more of: one or moreenergy values, or one or more energies relative to an energy of a datasubcarrier.
 4. The UE of claim 1, wherein the one or more processors arefurther configured to transmit one or more of: uplink signals formeasurement by a base station to determine the TR subcarriers forapplying the tone reservation, or a measurement report indicating achannel response of a downlink channel.
 5. The UE of claim 1, whereinthe one or more processors are further configured to: determine achannel response of the communication, including received energy onsubcarriers of the communication; estimate the TR subcarriers havingtone reservation applied based at least in part on received energy onthe TR subcarriers; and discard, rate matching, or zeroing out signalsreceived on the TR subcarriers.
 6. The UE of claim 5, wherein the one ormore processors are further configured to: determine the channelresponse based at least in part on data symbols and demodulationreference signals of the communication; or determine the channelresponse based at least in part on data symbols and not on demodulationreference signals of the communication.
 7. The UE of claim 5, whereinthe one or more processors are further configured to: estimate the TRsubcarriers having tone reservation applied based at least in part onthe TR subcarriers having a lowest received energy of subcarriers of thecommunication.
 8. The UE of claim 1, wherein the one or more processorsare further configured to receive one or more of: an indication thattone reservation is applied to the TR subcarriers of the communication;or an indication to use data symbols of the communication to estimatethe locations of the TR subcarriers.
 9. The UE of claim 1, wherein theparameters indicate one or more of: a number of subcarriers to whichtone reservation is to be applied, a fraction of subcarriers to whichtone reservation is to be applied, or a threshold energy for subcarriersto which tone reservation is to be applied.
 10. A UE for wirelesscommunication, comprising: a memory; and one or more processors, coupledto the memory, configured to: receive an indication of parameters that abase station uses for estimating locations of tone reservation (TR)subcarriers, wherein the estimating locations of TR subcarriers is basedat least in part on energies of data symbols of a communication, havingtone reservation applied for the communication; and transmit thecommunication having the tone reservation applied to the TR subcarriers.11. The UE of claim 10, wherein the parameters indicate one or more of:that a mask is to be applied to the TR subcarriers to boost or de-boosta tone reservation signal on one or more of the TR subcarriers, that oneor more energy floors are to be configured for the TR subcarriers, orone or more values of the one or more energy floors configured for theTR subcarriers.
 12. The UE of claim 11, wherein the parameters indicatethe one or more values of the one or more energy floors based at leastin part on one or more of: one or more energy values, or one or moreenergies relative to an energy of a data subcarrier.
 13. The UE of claim11, wherein the one or more processors are further configured to receivean indication of a mask to apply to the TR subcarriers, wherein the maskindicates to provide a power boost to one or more of the TR subcarriers.14. The UE of claim 13, wherein the mask is configured to improve apeak-to-average-power-ratio of the communication.
 15. The UE of claim13, wherein the mask is configured to maintain an energy gap between theTR subcarriers and data subcarriers of the communication, as observed bythe base station.
 16. The UE of claim 10, wherein the one or moreprocessors are further configured to: receive an indication to apply thetone reservation to the TR subcarriers of the communication based atleast in part on one or more of: measurements of one or more downlinksignals received from the base station, or a measurement report,received from the base station, indicating a channel response of anuplink channel.
 17. The UE of claim 16, wherein the indication to applythe tone reservation to the TR subcarriers of the communicationindicates to apply the tone reservation to the TR subcarriers based atleast in part on the TR subcarriers having an estimated lowest receivedenergy, as observed by the base station, of subcarriers of thecommunication on the data symbols of the communication.
 18. The UE ofclaim 10, wherein the one or more processors are further configured totransmit one or more of: an indication to apply tone reservation to theTR subcarriers of the communication; or an indication that the basestation is to use data symbols of the communication to estimate thelocations of the TR subcarriers.
 19. The UE of claim 10, wherein theparameters indicate one or more of: a number of subcarriers to whichtone reservation is to be applied, a fraction of subcarriers to whichtone reservation is to be applied, or a threshold energy for subcarriersto which tone reservation is to be applied.
 20. A method of wirelesscommunication performed by a user equipment (UE), comprising: receivingan indication of parameters for estimating locations of tone reservation(TR) subcarriers, wherein the estimating locations of TR subcarriers isbased at least in part on energies of data symbols of a communication,having tone reservation applied for the communication; and receiving thecommunication having the tone reservation applied to the TR subcarriers.21. The method of claim 20, wherein the parameters indicate one or moreof: that a mask is to be applied to the TR subcarriers to boost orde-boost a tone reservation signal on one or more of the TR subcarriers,that one or more energy floors are configured for the TR subcarriers, orone or more values of the one or more energy floors configured for theTR subcarriers.
 22. The method of claim 20, further comprisingtransmitting one or more of: uplink signals for measurement by a basestation to determine the TR subcarriers for applying the tonereservation, or a measurement report indicating a channel response of adownlink channel.
 23. The method of claim 20, further comprising:determining a channel response of the communication, including receivedenergy on subcarriers of the communication; estimating the TRsubcarriers having tone reservation applied based at least in part onreceived energy on the TR subcarriers; and discarding, rate matching, orzeroing out signals received on the TR subcarriers.
 24. The method ofclaim 20, wherein the parameters indicate one or more of: a number ofsubcarriers to which tone reservation is to be applied, a fraction ofsubcarriers to which tone reservation is to be applied, or a thresholdenergy for subcarriers to which tone reservation is to be applied.
 25. Amethod of wireless communication performed by a user equipment (UE),comprising: receiving an indication of parameters that a base stationuses for estimating locations of tone reservation (TR) subcarriers,wherein the estimating locations of TR subcarriers is based at least inpart on energies of data symbols of a communication, having tonereservation applied for the communication; and transmitting thecommunication having the tone reservation applied to the TR subcarriers.26. The method of claim 25, wherein the parameters indicate one or moreof: that a mask is to be applied to the TR subcarriers to boost orde-boost a tone reservation signal on one or more of the TR subcarriers,that one or more energy floors are to be configured for the TRsubcarriers, or one or more values of the one or more energy floorsconfigured for the TR subcarriers.
 27. The method of claim 25, furthercomprising receiving an indication of a mask to apply to the TRsubcarriers, wherein the mask indicates to provide a power boost to oneor more of the TR subcarriers.
 28. The method of claim 25, furthercomprising: receiving an indication to apply the tone reservation to theTR subcarriers of the communication based at least in part on one ormore of: measurements of one or more downlink signals received from thebase station, or a measurement report, received from the base station,indicating a channel response of an uplink channel.
 29. The method ofclaim 25, further comprising transmitting one or more of: an indicationto apply tone reservation to the TR subcarriers of the communication; oran indication that the base station is to use data symbols of thecommunication to estimate the locations of the TR subcarriers.
 30. Themethod of claim 25, wherein the parameters indicate one or more of: anumber of subcarriers to which tone reservation is to be applied, afraction of subcarriers to which tone reservation is to be applied, or athreshold energy for subcarriers to which tone reservation is to beapplied.